Royals vs. Mariners
Prediction, Odds & Props
Jun 30 | MLB AI Picks
Updated: 2025-06-28T03:31:50.923562ZBy Remi at Leans.AI — AI picks for ATS, ML, OU & props
The Seattle Mariners (43–40) will host the Kansas City Royals (39–45) on Monday, June 30, 2025, at 6:40 PM PDT at T-Mobile Park in Seattle, Washington. Both teams are looking to gain momentum as they approach the midseason mark, with the Mariners aiming to solidify their position in the AL West and the Royals seeking to climb the AL Central standings.
Get key insights, betting trends, and AI-powered predictions to help incorporate into your betting strategies.

GAME INFO
Date: Jun 30, 2025
Start Time: 9:40 PM EST
Venue: T-Mobile Park
Mariners Record: (43-40)
Royals Record: (39-45)
OPENING ODDS
KC Moneyline: +135
SEA Moneyline: -162
KC Spread: +1.5
SEA Spread: -1.5
Over/Under: 7.5
KC
Betting Trends
- The Royals have hit the Team Total Under in 54 of their last 77 games, indicating a trend toward lower-scoring performances.
SEA
Betting Trends
- The Mariners are 4–6 against the spread over their past 10 games, reflecting some inconsistency in covering the run line.
MATCHUP TRENDS
- In the last 6 games between these teams, the Over record is 4–2, suggesting a tendency toward higher-scoring games in recent matchups.
KC vs. SEA
Best Prop Bet
- Remi's searched hard and found the best prop for this matchup: R. Arozarena over 4.5 Fantasy Score.
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Kansas City vs Seattle Prediction & Odds:
Free MLB Betting Insights for 6/30/25
Kansas City has leaned heavily on a lineup that’s capable but inconsistent, and their recent trend of hitting the team total under in 54 of their last 77 games speaks to the offensive struggles they’ve faced throughout the season. Defensively, both teams have room to improve, and unforced errors could swing the outcome in what projects to be a closely contested game. Interestingly, the over has hit in four of the last six meetings between these two clubs, indicating that despite their offensive inconsistencies, they often find ways to score when facing off. The Mariners, in particular, will look to exploit Kansas City’s middle relief pitching, an area that has cost them multiple games late in contests, while Seattle’s late-game bullpen remains more stable and could be the difference if the game remains close into the seventh inning and beyond. With both clubs trying to avoid slipping into deeper holes within their divisions, this game holds more weight than their records might suggest, and the battle between Wacha’s command and the Mariners’ timely hitting will be a focal point. Ultimately, the Mariners have the edge on paper thanks to their recent form and home-field advantage, but the Royals have shown resilience in spurts and should not be counted out, especially if they can generate early offense and force Seattle to play from behind. Expect a game that leans heavily on pitching efficiency, error-free defense, and situational hitting, with both teams eager to use this contest as a launching point for a stronger second half of the season.
Bubic takes the bump this afternoon as we Salute to the Negro Leagues! pic.twitter.com/dgvarzHCMy
— Kansas City Royals (@Royals) June 29, 2025
Kansas City Royals MLB Preview
The Kansas City Royals enter Monday night’s game at T-Mobile Park with a 39–45 record and a sense of urgency as they aim to reverse recent fortunes and reassert themselves in the AL Central picture. Michael Wacha is expected to get the start, and the veteran right-hander remains a crucial figure in a pitching staff that has lacked consistency but is capable of shutting down lineups when he’s locating well and keeping hitters guessing with his changeup-heavy arsenal. Wacha’s experience and ability to induce soft contact will be especially important against a Mariners lineup that thrives in situational hitting and can grind out at-bats, and the Royals will look to support him with early run production to keep him in a position of leverage. Offensively, Kansas City continues to struggle to sustain rallies and generate consistent scoring, as evidenced by the team hitting the total under in 54 of their last 77 games, a statistic that underscores their inability to take advantage of scoring opportunities despite flashes of power from Salvador Perez and Bobby Witt Jr. Witt, in particular, remains a bright spot in the lineup, combining speed and pop with elite defensive ability, but he’s often lacked protection in the order, making it easier for opposing pitchers to work around him.
The Royals’ offensive game plan will likely rely on aggressive baserunning, short swings, and an emphasis on contact, as they’re not a lineup built to rely solely on home runs, and stringing hits together will be key against Seattle’s disciplined pitching staff. Defensively, Kansas City has made strides over the last few weeks, showing better fundamentals and cleaner execution, particularly in the infield, where double plays and good positioning have saved runs and reduced damage in tight games. However, their bullpen remains a concern, especially in late innings, where command issues and lack of depth have cost them winnable contests, so the Royals will be looking for a long outing from Wacha or perhaps piggybacking with a multi-inning reliever to bridge the gap to the ninth. Manager Matt Quatraro continues to emphasize player development alongside competitiveness, and games like this offer valuable reps for younger players while also testing their poise in high-leverage road environments. Kansas City has covered the run line in just under half of their games, and while they often stay within striking distance, they’ve struggled to close the deal in the later innings, which makes early scoring and clean defense all the more important. If the Royals can get solid at-bats from the bottom of their order and avoid mental lapses on the bases and in the field, they have a chance to make this a competitive game despite the Mariners holding the edge in pitching depth and recent form. With the trade deadline looming, players know that every game now serves as both a team opportunity and an individual audition, and how Kansas City responds to that pressure in games like this could shape the remainder of their season.

Credit: USA TODAY/IMAGN
Seattle Mariners MLB Preview
The Seattle Mariners return to T-Mobile Park on Monday with a 43–40 record and a golden opportunity to build momentum against the visiting Kansas City Royals, a club they have historically fared well against in recent matchups. With the AL West standings tightly packed, every win matters for Seattle, and playing at home gives them the upper hand in a series they are expected to control. Cal Raleigh continues to be the offensive cornerstone, leading the team in RBI production and giving the lineup much-needed stability, while young contributors like Julio Rodríguez and J.P. Crawford add athleticism and defensive range that make the Mariners a well-rounded club when all parts are clicking. The Mariners have been slightly inconsistent against the spread recently, going 4–6 in their last 10, but they’ve shown resilience, especially when their starting pitchers deliver quality outings that allow the bullpen to work in more structured, favorable situations. Seattle’s rotation has been the team’s backbone all season, with names like George Kirby and Logan Gilbert often giving them a chance to win on any given night, and whoever gets the ball in this game is expected to face a Kansas City lineup that has struggled to consistently score runs. Mariners pitchers will likely work aggressively in the strike zone, especially early in counts, as the Royals are known for a contact-oriented approach rather than working deep into at-bats.
From a bullpen standpoint, Seattle has improved its late-game efficiency, with Andrés Muñoz solidifying the closer role and middle relievers stepping up to bridge the gap more consistently in June. Defensively, the Mariners pride themselves on clean play, boasting one of the more dependable infield units in the league, with Eugenio Suárez anchoring the hot corner and Crawford providing elite range at short. The keys for Seattle will be to avoid extended scoring droughts—something that has plagued them in losses—and to take advantage of Kansas City’s weaker middle relief and defensive vulnerabilities. The Mariners’ offensive approach should focus on grinding out long at-bats, forcing Wacha into high pitch counts, and executing with runners in scoring position, a situational aspect they’ve worked hard to improve after struggling early in the season. With the Mariners winning four of their last five as moneyline favorites, they’ll enter this game confident but also aware of the need to maintain intensity against a Royals team capable of capitalizing on lapses. Playing in front of a home crowd that’s growing more energized as the season progresses, Seattle has a chance to use this game as a launching pad into a crucial July stretch that could determine their playoff trajectory. If they maintain their recent form on the mound and continue to build quality plate appearances from one through nine in the order, the Mariners are well-positioned to handle business, pick up another win, and reinforce their status as legitimate contenders in a crowded American League race.
Heading home with a winning road trip 🙌 #TridentsUp pic.twitter.com/avhr4gytqU
— Seattle Mariners (@Mariners) June 29, 2025
Kansas City vs. Seattle Prop Picks (AI)
Kansas City vs. Seattle Prediction (AI)

Remi, our AI sports genius, has been pouring over tons of data from every facet between the Royals and Mariners and using recursive machine learning and kick-ass AI to analyze the data to a single cover probability.
Remi has been most keyed in on the linear correlation of weight knucklehead sportsbettors often put on coaching factors between a Royals team going up against a possibly rested Mariners team. Trends look to say the true game analytics appear to reflect a slight lean against one Vegas line specifically.
Unlock this in-depth AI prediction and all of our MLB AI picks for FREE now.
Below is our current AI Kansas City vs Seattle picks, computer picks Royals vs Mariners, best bets, model edges, confidence ratings.
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DATE | GAME | LEAN | %WIN | UNITS | LEVEL |
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MLB | 9/26 | DET@BOS | UNLOCK THIS PICK | 5 |
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MLB | 9/26 | BAL@NYY | UNLOCK THIS PICK | 4 |
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MLB | 9/26 | ARI@SD | UNLOCK THIS PICK | 4 |
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MLB | 9/26 | NYM@MIA | UNLOCK THIS PICK | 1 |
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MLB | 9/26 | NYM@MIA | GET FREE PICK NOW | 1 | – | |
MLB | 9/26 | COL@SF | UNLOCK THIS PICK | 0 |
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These picks update as information changes—injury reports, weather, and market movement. Each line shows our model’s fair price, the edge versus the market, and a unit confidence rating (1–10). Odds and availability vary by sportsbook and time. Edges are computed against the listed price; value may change after line moves. Always shop for the best number. See the full MLB schedule.
Royals Betting Trends
The Royals have hit the Team Total Under in 54 of their last 77 games, indicating a trend toward lower-scoring performances.
Mariners Betting Trends
The Mariners are 4–6 against the spread over their past 10 games, reflecting some inconsistency in covering the run line.
Royals vs. Mariners Matchup Trends
In the last 6 games between these teams, the Over record is 4–2, suggesting a tendency toward higher-scoring games in recent matchups.
Kansas City vs. Seattle Game Info
What time does Kansas City vs Seattle start on June 30, 2025?
Kansas City vs Seattle starts on June 30, 2025 at 9:40 PM EST.
Where is Kansas City vs Seattle being played?
Venue: T-Mobile Park.
What are the opening odds for Kansas City vs Seattle?
Spread: Seattle -1.5
Moneyline: Kansas City +135, Seattle -162
Over/Under: 7.5
What are the records for Kansas City vs Seattle?
Kansas City: (39-45) | Seattle: (43-40)
What is the AI best bet for Kansas City vs Seattle?
Remi's searched hard and found the best prop for this matchup: R. Arozarena over 4.5 Fantasy Score.. Prices move—always shop for the best number.
What are Kansas City vs Seattle trending bets?
In the last 6 games between these teams, the Over record is 4–2, suggesting a tendency toward higher-scoring games in recent matchups.
What are Kansas City trending bets?
KC trend: The Royals have hit the Team Total Under in 54 of their last 77 games, indicating a trend toward lower-scoring performances.
What are Seattle trending bets?
SEA trend: The Mariners are 4–6 against the spread over their past 10 games, reflecting some inconsistency in covering the run line.
Where can I find AI Picks for Kansas City vs Seattle?
See our latest MLB picks and odds pages for 2025 to compare prices before you bet.
Kansas City vs. Seattle Odds
AI algorithm Remi is pouring through loads of data points on each line. In fact, anytime the Kansas City vs Seattle trends are analyzed, there’s always several intriguing observations to key in on. Not to mention games played at extreme altitude almost always follow normal, predictable betting trends.
Kansas City vs Seattle Opening Odds
KC Moneyline:
+135 SEA Moneyline: -162
KC Spread: +1.5
SEA Spread: -1.5
Over/Under: 7.5
Kansas City vs Seattle Live Odds
Games | PTS | ML | SPR | O/U | |
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Sep 27, 2025 1:06PM EDT
Baltimore Orioles
New York Yankees
9/27/25 1:06PM
Orioles
Yankees
|
–
–
|
+194
-235
|
+1.5 (-105)
-1.5 (-114)
|
O 8.5 (-122)
U 8.5 (+100)
|
|
Sep 27, 2025 2:21PM EDT
St Louis Cardinals
Chicago Cubs
9/27/25 2:21PM
Cardinals
Cubs
|
–
–
|
-168
|
-1.5 (+118)
|
O 9 (-122)
U 9 (+100)
|
|
Sep 27, 2025 3:09PM EDT
Tampa Bay Rays
Toronto Blue Jays
9/27/25 3:09PM
Rays
Blue Jays
|
–
–
|
+132
-156
|
+1.5 (-154)
-1.5 (+128)
|
O 8.5 (-106)
U 8.5 (-114)
|
|
Sep 27, 2025 4:06PM EDT
Chicago White Sox
Washington Nationals
9/27/25 4:06PM
White Sox
Nationals
|
–
–
|
+102
-120
|
-1.5 (+162)
+1.5 (-196)
|
O 8.5 (-110)
U 8.5 (-110)
|
|
Sep 27, 2025 4:06PM EDT
Colorado Rockies
San Francisco Giants
9/27/25 4:06PM
Rockies
Giants
|
–
–
|
+198
-240
|
+1.5 (-110)
-1.5 (-110)
|
O 8 (-108)
U 8 (-112)
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|
Sep 27, 2025 4:11PM EDT
New York Mets
Miami Marlins
9/27/25 4:11PM
Mets
Marlins
|
–
–
|
-124
+106
|
-1.5 (+130)
+1.5 (-156)
|
O 8.5 (-112)
U 8.5 (-108)
|
|
Sep 27, 2025 6:05PM EDT
Minnesota Twins
Philadelphia Phillies
9/27/25 6:05PM
Twins
Phillies
|
–
–
|
+177
-197
|
+1.5 (-118)
-1.5 (-102)
|
O 8.5 (-118)
U 8.5 (-102)
|
|
Sep 27, 2025 7:11PM EDT
Cincinnati Reds
Milwaukee Brewers
9/27/25 7:11PM
Reds
Brewers
|
–
–
|
+128
-152
|
+1.5 (-178)
-1.5 (+146)
|
O 7.5 (-120)
U 7.5 (-102)
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|
Sep 27, 2025 7:15PM EDT
Pittsburgh Pirates
Atlanta Braves
9/27/25 7:15PM
Pirates
Braves
|
–
–
|
+143
-158
|
+1.5 (-150)
-1.5 (+130)
|
O 8.5 (+100)
U 8.5 (-120)
|
|
Sep 27, 2025 7:16PM EDT
Texas Rangers
Cleveland Guardians
9/27/25 7:16PM
Rangers
Guardians
|
–
–
|
+132
-156
|
+1.5 (-172)
-1.5 (+142)
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O 7 (-120)
U 7 (-102)
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Sep 27, 2025 8:40PM EDT
Arizona Diamondbacks
San Diego Padres
9/27/25 8:40PM
Diamondbacks
Padres
|
–
–
|
+120
-132
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+1.5 (-180)
-1.5 (+157)
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O 7.5 (-115)
U 7.5 (-105)
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Sep 27, 2025 9:41PM EDT
Los Angeles Dodgers
Seattle Mariners
9/27/25 9:41PM
Dodgers
Mariners
|
–
–
|
+102
-120
|
+1.5 (-215)
-1.5 (+180)
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O 7.5 (-110)
U 7.5 (-110)
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Sep 27, 2025 10:05PM EDT
Kansas City Royals
Oakland Athletics
9/27/25 10:05PM
Royals
Athletics
|
–
–
|
+104
-115
|
+1.5 (-185)
-1.5 (+161)
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O 10 (-110)
U 10 (-110)
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MLB Past Picks
Remi—our in-house AI—prices every game and prop using multi-season priors, tempo/efficiency, injury/usage signals, and market movement.
We publish fair prices, recommended “buy-to” numbers, and confidence so you can bet prices, not teams.
This preview covers Kansas City Royals vs. Seattle Mariners on June 30, 2025 at T-Mobile Park.
Odds shown reflect widely available numbers and may update closer to kickoff.
Want more? Check live edges, player props, and line moves on our MLB odds pages, and compare prices before you place a bet.
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LEAN | %WIN | UNITS | RESULT |
---|---|---|---|---|
NYM@CHC | NYM -110 | 54.1% | 3 | WIN |
HOU@ATH | ATH +118 | 50.8% | 4 | WIN |
NYM@CHC | OVER 7 | 54.5% | 3 | WIN |
STL@SF | OVER 7.5 | 55.9% | 5 | LOSS |
KC@LAA | TYLER TOLBERT UNDER 1.5 BASES | 54.4% | 4 | WIN |
MIL@SD | UNDER 9 | 54.7% | 4 | WIN |
MIA@PHI | KYLE SCHWARBER OVER 1.5 HITS+RUNS+RBIS | 53.3% | 3 | WIN |
WAS@NYM | OVER 8.5 | 56.1% | 6 | LOSS |
LAA@COL | COL +108 | 50.5% | 3 | WIN |
TOR@KC | UNDER 9 | 54.7% | 4 | LOSS |
SEA@KC | KC +1.5 | 62.3% | 5 | LOSS |
NYY@MIN | OVER 9 | 55.1% | 4 | WIN |
MIA@COL | OVER 10.5 | 55.0% | 4 | WIN |
MIA@COL | AGUSTIN RAMIREZ OVER 1.5 HITS+RUNS+RBIS | 54.3% | 4 | WIN |
SEA@KC | BOBBY WITT UNDER 0.5 SINGLES | 54.4% | 4 | LOSS |
PHI@LAD | LAD -113 | 54.7% | 4 | LOSS |
NYY@BOS | OVER 7.5 | 54.3% | 3 | WIN |
KC@PHI | PHI -130 | 58.3% | 4 | WIN |
LAD@SF | OVER 7.5 | 54.7% | 4 | LOSS |
NYM@PHI | PHI -122 | 55.6% | 4 | WIN |
KC@CLE | KC -104 | 52.0% | 3 | WIN |
CIN@SD | JAKE CRONEWORTH OVER 0.5 HITS | 53.1% | 3 | WIN |
WAS@MIA | MIA -123 | 55.2% | 4 | LOSS |
LAA@KC | UNDER 9.5 | 54.9% | 3 | WIN |
TEX@ARI | UNDER 9 | 54.2% | 4 | WIN |
SF@COL | UNDER 11.5 | 56.4% | 6 | LOSS |
SF@COL | RAFAEL DEVERS OVER 1.5 BASES | 56.1% | 6 | WIN |
MIA@WAS | WAS -110 | 54.4% | 4 | WIN |
NYM@DET | OVER 8.5 | 54.5% | 4 | WIN |
TEX@ARI | UNDER 9.5 | 56.4% | 6 | WIN |
TEX@ARI | ALEJANDRO OSUNA UNDER 1.5 BASES | 54.1% | 4 | LOSS |
ATL@CHC | CHC -116 | 55.1% | 3 | WIN |
PHI@MIL | OVER 8.5 | 55.0% | 3 | WIN |
ARI@LAD | SHOHEI OHTANI OVER 2.5 BASES | 54.2% | 4 | WIN |
SEA@CLE | CLE +1.5 | 57.2% | 3 | WIN |
CHC@SF | CHC -105 | 54.1% | 4 | LOSS |
NYY@CHW | RYAN MCMAHON OVER 0.5 BASES | 54.1% | 4 | WIN |
PHI@NYM | OVER 8.5 | 55.6% | 4 | LOSS |
LAA@TEX | LOGAN OHOPPE OVER 1.5 HITS+RUNS+RBIS | 54.1% | 4 | LOSS |
KC@CHW | KC -109 | 54.2% | 4 | WIN |
SD@SEA | DYLAN CEASE OVER 16.5 OUTS | 53.9% | 3 | LOSS |
SD@SEA | UNDER 8.5 | 54.4% | 4 | LOSS |
MIN@TOR | JOE RYAN UNDER 2.5 EARNED RUNS | 54.1% | 4 | LOSS |
SF@MIL | MIL +100 | 54.0% | 6 | LOSS |
TOR@MIA | MIA +1.5 | 62.0% | 6 | WIN |
CHC@LAA | OVER 9.5 | 54.9% | 4 | LOSS |
BOS@NYY | CARLOS RODON UNDER 4.5 HITS ALLOWED | 54.2% | 4 | WIN |
KC@DET | DET -115 | 56.1% | 5 | WIN |
CHC@LAA | LAA +1.5 | 57.6% | 5 | LOSS |
CIN@ARI | KEBRYAN HAYES STRIKEOUTS UNDER 0.5 | 56.2% | 6 | WIN |
LAD@SD | SD +110 | 50.9% | 6 | WIN |