Mariners vs Rockies Prediction, Odds & Player Prop Bets Today – MLB, Apr 21

Colorado Rockies center fielder Brenton Doyle (9) in the third inning of a baseball game Sunday, Oct. 1, 2023, in Denver. (AP Photo/David Zalubowski)
(AP Photo/David Zalubowski)
  • The Mariners are -190 favorites vs the Rockies
  • Mariners vs Rockies Over / Under today: 10.5 Runs
  • Mariners / Rockies TV Channel: ROTV | RTNW

The Seattle Mariners (-190) visit Coors Field to take on the Colorado Rockies (+155) on Sunday, April 21, 2024. First pitch is scheduled for 8:10pm EDT in Denver, CO.

This season, the Mariners are 10-10 against the spread (ATS), while the Rockies are 9-11 ATS.

Mariners vs Rockies Starting Pitchers Today:

  • Mariners starting pitcher: George Kirby 2-2, 5.67 ERA
  • Rockies starting pitcher: Cal Quantrill 0-2, 5.67 ERA

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

SpreadOver / UnderMoneyline
Mariners-1.5 -120O 10.5 -110-190
Rockies +1.5 +100U 10.5 -110+155

Mariners vs Rockies Prediction for Today’s Game

Based on recent trends the model predicts the Mariners will win Sunday‘s MLB game with 65.7% 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 Mariners players for Sunday‘s game, looking at profitable historical betting trends:

Best Mariners Player Prop Bets Today:

  • George Kirby has hit the Pitching Outs Over in 22 of his last 32 games (+8.70 Units / 19% ROI)
  • Logan Gilbert has hit the Pitching Outs Over in 21 of his last 31 games (+8.40 Units / 19% ROI)
  • Luis Urias has hit the Singles Under in his last 8 games (+8.00 Units / 41% ROI)
  • George Kirby has hit the Earned Runs Over in 10 of his last 13 away games (+7.25 Units / 48% ROI)
  • Logan Gilbert has hit the Earned Runs Under in 10 of his last 14 away games (+5.30 Units / 32% ROI)

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

Best Rockies Player Prop Best Bets Today:

  • Austin Gomber has hit the Earned Runs Under in 19 of his last 27 games (+10.05 Units / 29% ROI)
  • Jake Cave has hit the Hits Under in 9 of his last 11 games at home (+9.90 Units / 90% ROI)
  • Cal Quantrill has hit the Strikeouts Under in 15 of his last 19 games (+9.75 Units / 33% ROI)
  • Jake Cave has hit the Singles Under in 10 of his last 11 games at home (+8.40 Units / 47% ROI)
  • Jake Cave has hit the Total Bases Under in 9 of his last 11 games at home (+8.05 Units / 58% ROI)
  • The Seattle Mariners have hit the 1st Five Innings (F5) Moneyline in 24 of their last 40 away games (+12.89 Units / 24% ROI)
  • The Seattle Mariners have covered the 1st Five Innings (F5) Run Line in 28 of their last 42 away games (+12.17 Units / 25% ROI)
  • The Seattle Mariners have hit the Game Total Over in 18 of their last 26 away games (+10.55 Units / 37% ROI)
  • The Seattle Mariners have hit the Moneyline in 27 of their last 43 away games (+9.35 Units / 16% ROI)
  • The Seattle Mariners have hit the 1st Five Innings (F5) Team Total Over in 25 of their last 40 away games (+8.69 Units / 19% ROI)
  • The Colorado Rockies have hit the Moneyline in 34 of their last 69 games at home (+12.00 Units / 17% ROI)
  • The Colorado Rockies have covered the Run Line in 39 of their last 69 games at home (+11.30 Units / 15% ROI)
  • The Colorado Rockies have hit the Game Total Under in 77 of their last 142 games (+7.20 Units / 5% ROI)
  • The Colorado Rockies have hit the 1st Five Innings (F5) Moneyline in 2 of their last 5 games (+0.27 Units / 5% ROI)
  • The Colorado Rockies have hit the 1st Five Innings (F5) Team Total Under in 3 of their last 5 games (+0.20 Units / 3% ROI)

Mariners Against the Spread (ATS) Record

Against the spread this season, the Mariners are 9-11 against the Run Line (-2.3 Units / -8.86% ROI).

  • 10-10 when betting on the Moneyline for -1.8 Units / -7.23% ROI
  • 6-13 when betting on the total runs Over for -8.25 Units / -37.5% ROI
  • 13-6 when betting on the total runs Under for +6.35 Units / 28.73% ROI

Rockies Against the Spread (ATS) Record

Against the spread this season, the Rockies are 9-11 against the Run Line (-3.6 Units / -15.93% ROI).

  • 4-16 when betting on the Moneyline for -9.6 Units / -47.88% ROI
  • 10-10 when betting on the total runs Over for -1 Units / -4.52% ROI
  • 10-10 when betting on the total runs Under for -0.9 Units / -4.11% ROI

George Kirby has a strike rate of 72% (125/173) against right-handed batters this season — 2nd highest among qualified SPs in MLB; League Avg: 65% — 98th Percentile.

George Kirby has not walked any of the 36 batters that he has faced when going through the lineup the second time in a game this season — best among in AL; League Avg: 7% — 100th Percentile.

George Kirby has walked 2 of 89 batters (2%) this season — 3rd best among in AL; League Avg: 7% — 95th Percentile.

George Kirby has walked 7 of 313 batters (2%) when going through the lineup the second time in a game since last season — best among qualified SPs in MLB; League Avg: 7% — 100th Percentile.

Rockies Starting Pitcher Stats & Trends

Cal Quantrill has a strikeout rate of just 25% (11 SO in 44 PAs) with two-strikes this season — lowest among in NL; League Avg: 43% — second Percentile.

Cal Quantrill has a strikeout rate of just 25% (11 SO in 44 PAs) with two-strikes this season — 2nd lowest among qualified SPs in MLB; League Avg: 43% — second Percentile.

Opponents are hitting .316 (12-for-38) against Cal Quantrill with two-strikes this season — highest among in NL; League Avg: .160 — second Percentile.

Cal Quantrill has allowed an OPS of .807 (44 PA’s) with two-strikes this season — 2nd highest among in NL; League Avg: .484 — fourth Percentile.

Mariners Keys to the Game vs. the Rockies

The Mariners are 147-6 (.961) when leading entering the 8th inning since the 2022 season — best in MLB; League Avg: .906.

The Mariners are 47-7 (.870) when they’ve had 10 or more hits since the 2023 season — best in MLB; League Avg: .732.

The Mariners are 85-2 (.977) when leading entering the 9th inning since the 2023 season — tied for 4th best in MLB; League Avg: .948.

The Mariners are 79-5 (.940) when leading entering the 8th inning since the 2023 season — 3rd best in MLB; League Avg: .898.

Rockies Keys to the Game vs. the Mariners

The Rockies are just 49-14 (.778) when leading entering the 8th inning since the 2023 season — lowest in MLB; League Avg: .898.

The Rockies are just 45-22 (.672) when leading entering the 7th inning since the 2023 season — lowest in MLB; League Avg: .855.

The Rockies are just 17-16 (.515) when they’ve had 5 or more XBH since the 2023 season — lowest in MLB; League Avg: .791.

The Rockies are just 0-1 (.000) after a win as favorites since the 2023 season — lowest in MLB; League Avg: .578.

Mariners hitters are slugging just .163 with two-strikes this season — lowest in MLB; League Avg: .249.

The Mariners are batting just .126 on pitches out of the zone since the 2022 season — 2nd lowest in MLB; League Avg: .154.

Mariners hitters have 467 strikeouts in 1,814 PA’s (26%) against LHP since last season — highest in MLB; League Avg: 22%.

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

The Rockies have won just 46% of road games in which they have scored three or more runs in an inning since the 2022 season — lowest in MLB; League Avg: 74%.

The Rockies have won just 50% 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 Rockies won only 27% of their road games in the 2023 season — lowest in MLB; League Avg: 48%.

The Rockies are just 49-14 (.778) when leading entering the 8th inning since the 2023 season — lowest in MLB; League Avg: .898.

Mariners pitchers have a strikeout rate of just 14% with runners in scoring position this season — 2nd lowest in MLB; League Avg: 21%.

Mariners pitchers have walked 19 of 383 batters (5%) over the last 14 days — best in MLB; League Avg: 9%.

Mariners pitchers have walked 464 of 6,730 batters (7%) since last season — 2nd best in MLB; League Avg: 9%.

Mariners pitchers have a strikeout rate of just 12% with runners in scoring position over the last 14 days — tied for lowest in MLB; League Avg: 21%.

Opponents have a miss rate of just 21% against Rockies pitchers since last season — lowest in MLB; League Avg: 26%.

Rockies pitchers have a strikeout rate of just 17% with runners in scoring position since last season — lowest in MLB; League Avg: 22%.

Rockies pitchers have a strikeout rate of just 18% since last season — lowest in MLB; League Avg: 23%.

Opponents have a miss rate of just 22% against Rockies pitchers since the 2022 season — lowest in MLB; League Avg: 26%.

Rockies vs. Mariners Injuries Tonight That May Affect Prop Bets 

  • German Marquez (Colorado Rockies): Elbow, 60-Day IL
  • Lucas Gilbreath (Colorado Rockies): Elbow, 15-Day IL
  • Antonio Senzatela (Colorado Rockies): Elbow, 60-Day IL
  • Daniel Bard (Colorado Rockies): Knee, 15-Day IL
  • 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

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Our BetMGM editors and authors are sports experts with a wealth of knowledge of the sports industry at all levels. Their coverage includes sports news, previews and predictions, fun facts, and betting.