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.

AI Sports Betting Algorithm Remi

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

Monday’s matchup between the Seattle Mariners and the Kansas City Royals at T-Mobile Park is a midseason clash between two American League teams looking to solidify their identities and gain momentum heading into July. The Mariners come in with a 43–40 record and sit in a tightly contested AL West race, where consistency on both sides of the ball has been their key challenge despite moments of brilliance. They’ve shown strength at home and recently won four of their last five games as moneyline favorites, suggesting they’re beginning to find their rhythm, especially against teams with sub-.500 records. Cal Raleigh has stepped up as a reliable offensive contributor, and the Mariners’ lineup, though not overpowering, has delivered when needed, particularly in tight, low-scoring contests. Their pitching staff remains the backbone of their identity, with young arms and veterans providing steady innings, but they’ll need to keep the Royals’ lineup in check, especially early in the game, to avoid putting pressure on their bullpen. The Royals, entering the game with a 39–45 record, remain in search of a spark to push them up the AL Central standings, and Michael Wacha is expected to take the mound, bringing veteran savvy and the ability to keep hitters off-balance when his command is sharp.

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.

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.

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. Kansas City vs Seattle AI Prediction: Free MLB Betting Insights for Jun 30. Credit USA TODAY/IMAGN

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.

Kansas City vs. Seattle Prop Picks (AI)

Remi is pouring through loads of data on each player. In fact, anytime the Royals and Mariners play there’s always several intriguing observations to key in on. Not to mention games played at T-Mobile Park in Jun almost always follow normal, predictable betting trends.
Remi's searched hard and found the best prop for this matchup: R. Arozarena over 4.5 Fantasy Score.

Kansas City vs. Seattle Prediction (AI)

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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.

DATE GAME LEAN %WIN UNITS LEVEL
MLB 9/26 DET@BOS UNLOCK THIS PICK 5 EXECUTIVE Locked EXECUTIVE
MLB 9/26 BAL@NYY UNLOCK THIS PICK 4 INTEL Locked INTEL
MLB 9/26 ARI@SD UNLOCK THIS PICK 4 EXECUTIVE Locked EXECUTIVE
MLB 9/26 NYM@MIA UNLOCK THIS PICK 1 INTEL Locked INTEL
MLB 9/26 NYM@MIA GET FREE PICK NOW 1
MLB 9/26 COL@SF UNLOCK THIS PICK 0 INTEL Locked INTEL

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

Kansas City vs Seattle starts on June 30, 2025 at 9:40 PM EST.

Spread: Seattle -1.5
Moneyline: Kansas City +135, Seattle -162
Over/Under: 7.5

Kansas City: (39-45)  |  Seattle: (43-40)

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.

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 trend: The Royals have hit the Team Total Under in 54 of their last 77 games, indicating a trend toward lower-scoring performances.

SEA trend: The Mariners are 4–6 against the spread over their past 10 games, reflecting some inconsistency in covering the run line.

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
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)
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)
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)
O 7 (-120)
U 7 (-102)
Sep 27, 2025 8:40PM EDT
Arizona Diamondbacks
San Diego Padres
9/27/25 8:40PM
Diamondbacks
Padres
+120
-132
+1.5 (-180)
-1.5 (+157)
O 7.5 (-115)
U 7.5 (-105)
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)
O 7.5 (-110)
U 7.5 (-110)
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)
O 10 (-110)
U 10 (-110)

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.

    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