Royals vs Mariners Prediction, Odds & Player Prop Bets Today – MLB, May 15

Seattle Mariners designated hitter Mitch Haniger, left, follows through on a home run against the Cleveland Guardians during the first inning of a spring training baseball game Sunday, Feb. 25, 2024, in Peoria, Ariz. (AP Photo/Lindsey Wasson)
(AP Photo/Lindsey Wasson)
  • The Mariners are -145 favorites vs the Royals
  • Royals vs Mariners Over / Under today: 8 Runs
  • Royals / Mariners TV Channel: RTNW | BSKC

The Kansas City Royals (+120) visit T-Mobile Park to take on the Seattle Mariners (-145) on Wednesday, May 15, 2024. First pitch is scheduled for 4:10pm EDT in Seattle, WA.

This season, the Royals are 26-18 against the spread (ATS), while the Mariners are 21-22 ATS.

Royals vs Mariners Starting Pitchers Today:

  • Royals starting pitcher: Alec Marsh 3-0, 2.53 ERA
  • Mariners starting pitcher: Bryan Woo 0-0, 0.00 ERA

Royals vs. Mariners Odds, Run Line, Over/Under & Moneyline

SpreadOver / UnderMoneyline
Royals+1.5 -165O 7.5 -105+120
Mariners -1.5 +140U 7.5 -115-145

Royals vs Mariners Prediction for Today’s Game

Based on recent trends the model predicts the Mariners will win Wednesday‘s MLB game with 55.6% confidence, factoring in game simulations, recent player performances, starting pitchers and injuries.


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We’ve highlighted some favorite MLB player prop bets for Royals players for Wednesday‘s game, looking at profitable historical betting trends:

Best Royals Player Prop Bets Today:

  • MJ Melendez has hit the Runs Under in 23 of his last 25 games (+19.95 Units / 48% ROI)
  • MJ Melendez has hit the Hits Under in 19 of his last 25 games (+19.45 Units / 77% ROI)
  • MJ Melendez has hit the Hits Runs and RBIs Under in 21 of his last 25 games (+16.95 Units / 55% ROI)
  • MJ Melendez has hit the Total Bases Under in 20 of his last 25 games (+15.40 Units / 49% ROI)
  • MJ Melendez has hit the Singles Under in 27 of his last 35 games (+13.90 Units / 23% ROI)

And here are some favorite MLB player prop bets for Mariners players for Wednesday‘s game, looking at profitable historical betting trends:

Best Mariners Player Prop Best Bets Today:

  • Julio Rodriguez has hit the Total Bases Under in 29 of his last 41 games (+13.75 Units / 24% ROI)
  • Jorge Polanco has hit the Hits Runs and RBIs Under in 28 of his last 40 games (+13.50 Units / 27% ROI)
  • Jorge Polanco has hit the Runs Under in 29 of his last 40 games (+12.75 Units / 20% ROI)
  • Josh Rojas has hit the Hits Over in 17 of his last 20 games (+10.50 Units / 27% ROI)
  • Mitch Garver has hit the Home Runs Over in 4 of his last 10 games at home (+10.30 Units / 103% ROI)
  • The Kansas City Royals have covered the Run Line in 26 of their last 40 games (+10.94 Units / 20% ROI)
  • The Kansas City Royals have hit the Game Total Under in 14 of their last 23 games (+5.25 Units / 21% ROI)
  • The Kansas City Royals have hit the 1st Five Innings (F5) Team Total Under in 15 of their last 25 games (+4.90 Units / 16% ROI)
  • The Kansas City Royals have hit the Moneyline in 13 of their last 21 games (+4.65 Units / 20% ROI)
  • The Seattle Mariners have covered the Run Line in 10 of their last 14 games at home (+9.05 Units / 57% ROI)
  • The Seattle Mariners have covered the 1st Five Innings (F5) Run Line in 11 of their last 14 games at home (+7.50 Units / 44% ROI)
  • The Seattle Mariners have hit the Game Total Under in 15 of their last 23 games at home (+7.00 Units / 27% ROI)
  • The Seattle Mariners have hit the 1st Five Innings (F5) Moneyline in 10 of their last 14 games at home (+6.80 Units / 32% ROI)
  • The Seattle Mariners have hit the Team Total Under in 12 of their last 19 games at home (+4.60 Units / 21% ROI)

Royals Against the Spread (ATS) Record

Against the spread this season, the Royals are 27-17 against the Run Line (+7.34 Units / 12% ROI).

  • 26-18 when betting on the Moneyline for +9.45 Units / 18.62% ROI
  • 16-25 when betting on the total runs Over for -11.5 Units / -24.24% ROI
  • 25-16 when betting on the total runs Under for +7.45 Units / 15.77% ROI

Mariners Against the Spread (ATS) Record

Against the spread this season, the Mariners are 21-22 against the Run Line (-3.2 Units / -5.59% ROI).

  • 23-20 when betting on the Moneyline for -2.15 Units / -3.98% ROI
  • 14-27 when betting on the total runs Over for -15.3 Units / -33.55% ROI
  • 27-14 when betting on the total runs Under for +11.2 Units / 23.86% ROI

Mariners vs Royals Home Run Prop Bets Today

Over Under
Cal Raleigh (SEA) 0.5 +300 0.5 -400
MJ Melendez (KC) 0.5 +375 0.5 -550
Salvador Perez (KC) 0.5 +375 0.5 -550
Vinnie Pasquantino (KC) 0.5 +425 0.5 -600
Mitch Garver (SEA) 0.5 +450 0.5 -650

Mariners vs Royals Total Hits Prop Bets Today

Over Under
Maikel Garcia (KC) 0.5 -225 0.5 +170
Josh Rojas (SEA) 0.5 -210 0.5 +155
Salvador Perez (KC) 0.5 -210 0.5 +160
Ty France (SEA) 0.5 -210 0.5 +155
Vinnie Pasquantino (KC) 0.5 -200 0.5 +145

Mariners vs Royals RBI Prop Bets Today

Over Under
Cal Raleigh (SEA) 0.5 +120 0.5 -155
Vinnie Pasquantino (KC) 0.5 +145 0.5 -190
Salvador Perez (KC) 0.5 +150 0.5 -200
Julio Rodriguez (SEA) 0.5 +150 0.5 -200
Bobby Witt Jr. (KC) 0.5 +170 0.5 -225

Mariners vs Royals Strikeout Prop Bets Today

Over Under
Bryan Woo (SEA) 4.5 -165 4.5 +130
Alec Marsh (KC) 5.5 -120 5.5 -110

Alec Marsh has walked 28 of 195 batters (14%) when going through the lineup the second time in a game since last season — highest in MLB among starting pitchers with at least 80 total IP; League Avg: 8% — 0 Percentile.

Alec Marsh has allowed an OBP of just .121 (33 PA’s) with runners in scoring position this season — best in MLB among starting pitchers with at least 15 total IP; League Avg: .319 — 100th Percentile.

Opponents have a miss rate of 40% (19/47) against Alec Marsh over the past seven days (1 games) — best in AL over the last week; League Avg: 25% — 100th Percentile.

Opponents are hitting just .097 (3-for-31) against Alec Marsh with runners in scoring position this season — 9th best in MLB among starting pitchers with at least 15 total IP; League Avg: .251 — 94th Percentile.

Mariners Starting Pitcher Stats & Trends

Bryan Woo has thrown fastballs 73% of the time (1,096/1,510) since last season — highest in MLB among starting pitchers with at least 80 total IP; League Avg: 47% — 100th Percentile.

Bryan Woo has allowed an average Exit Velocity of just 88.1 MPH against his fastballs since last season (177 balls in play) — tied for 3rd best in MLB among starting pitchers with at least 80 total IP; League Avg: 91.0

68% of Bryan Woo’s strikeouts have come on 95+ MPH fastballs since last season — tied for highest in MLB among starting pitchers with at least 80 total IP; League Avg: 20% — 100th Percentile.

Bryan Woo allowed an average Exit Velocity of 87.4 MPH (237 batted balls) in the 2023 season — tied for 13th best in MLB among starting pitchers with at least 64 total IP; League Avg: 89.2 — 93rd Percentile.

Royals Keys to the Game vs. the Mariners

The Royals are just 3-11 (.214) when tied entering the 8th inning since the 2023 season — lowest in MLB; League Avg: .500.

The Royals are just 21-47 (.309) after a road win since the 2022 season — lowest in MLB; League Avg: .490.

The Royals are just 14-88 (.137) when their opponents score in the first inning since the 2022 season — lowest in MLB; League Avg: .364.

The Royals are just 11-56 (.164) when allowing 2 or more home runs since the 2023 season — 2nd lowest in MLB; League Avg: .310.

Mariners Keys to the Game vs. the Royals

The Mariners are 158-6 (.963) when leading entering the 8th inning since the 2022 season — best in MLB; League Avg: .906.

The Mariners are 90-5 (.947) when leading entering the 8th inning since the 2023 season — tied for best in MLB; League Avg: .899.

The Mariners are 164-3 (.982) when leading entering the 9th inning since the 2022 season — best in MLB; League Avg: .950.

The Mariners are 16-14 (.533) after a win as underdogs since the 2023 season — 4th best in MLB; League Avg: .423.

The Royals have won just 51% of games in which they have scored in at least three different innings on the road since the 2022 season — lowest in MLB; League Avg: 72%.

The Royals have won just 45% of games in which they have scored in at least three different innings on the road since last season — lowest in MLB; League Avg: 72%.

Royals hitters have an OBP of just .281 (3,737 PA’s) on the road since last season — lowest in MLB; League Avg: .315.

Royals hitters have an OBP of just .236 (381 PA’s) when leading off an inning this season — lowest in MLB; League Avg: .303.

Mariners hitters have 343 strikeouts in 1,184 PA’s (29%) against RHP this season — highest in MLB; League Avg: 23%.

Mariners hitters have put just 33% of their swings in play with two-strikes since last season — lowest in MLB; League Avg: 37%.

The Mariners are batting just .125 on pitches out of the zone since the 2022 season — 2nd lowest in MLB; League Avg: .154.

Mariners hitters are slugging just .178 on pitches out of the zone since the 2022 season — tied for 2nd lowest in MLB; League Avg: .213.

Royals pitchers have won only 13% of games in which they have allowed their opponent to score in three different innings on the road since the 2022 season — lowest in MLB; League Avg: 26%.

The Royals won just 18% of games in which their opponents scored first in the 2023 season — lowest in MLB; League Avg: 34%.

The Royals have won just 15% of road games in which their opponents scored first since the 2022 season — 2nd lowest in MLB; League Avg: 28%.

The Royals have won just 22% of games in which their opponents scored first since the 2022 season — 2nd lowest in MLB; League Avg: 32%.

Mariners pitchers have walked 215 of 3,286 batters (7%) when facing the leadoff batter in the inning since the 2022 season — 3rd best in MLB; League Avg: 8%.

Opponents have a groundball rate of just 38% against Mariners pitchers this season — 3rd lowest in MLB; League Avg: 43%.

Mariners pitchers have walked 528 of 7,541 batters (7%) since last season — tied for best in MLB; League Avg: 9%.

Opponents have a miss rate of 27% against Mariners pitchers this season — 5th best in MLB; League Avg: 25%.

Mariners vs. Royals Injuries Tonight That May Affect Prop Bets 

  • Jackson Kowar (Seattle Mariners): Elbow, 60-Day IL
  • Mitch Garver (Seattle Mariners): Back, Day-To-Day
  • Sam Haggerty (Seattle Mariners): Undisclosed, 10-Day IL
  • Gregory Santos (Seattle Mariners): Lat, 15-Day IL
  • Eduard Bazardo (Seattle Mariners): Shoulder, 15-Day IL
  • Bryan Woo (Seattle Mariners): Elbow, 15-Day IL
  • Matt Brash (Seattle Mariners): Elbow, 15-Day IL
  • Kyle Wright (Kansas City Royals): Shoulder, 60-Day IL
  • Austin Cox (Kansas City Royals): Knee, Day-To-Day
  • Michael Massey (Kansas City Royals): Back, 10-Day IL
  • Jake Brentz (Kansas City Royals): Hamstring, 15-Day IL
  • Josh Taylor (Kansas City Royals): Biceps, 15-Day IL
  • Carlos Hernandez (Kansas City Royals): Shoulder, 15-Day IL
  • Kris Bubic (Kansas City Royals): Elbow, 60-Day IL

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About the Author

Shane Jackson

Read More @Sjacksonmgm

Shane Jackson is a Web Content Writer for BetMGM, covering MLB and NBA. After graduating from the University of Kansas, his previous stops include MLB.com, Lawrence Journal-World, Manhattan Mercury, Bet Chicago Sports, WynnBET, and Sportsbook Review.

Shane Jackson is a Web Content Writer for BetMGM, covering MLB and NBA. After graduating from the University of Kansas, his previous stops include MLB.com, Lawrence Journal-World, Manhattan Mercury, Bet Chicago Sports, WynnBET, and Sportsbook Review.