Astros vs Mariners Prediction, Odds & Player Prop Bets Today – MLB, Apr 9

Seattle Mariners' J.P. Crawford follows through during an at-bat a baseball game against the Texas Rangers, Saturday, Sept. 30, 2023, in Seattle. (AP Photo/Lindsey Wasson)
(AP Photo/Lindsey Wasson)
  • The Astros are -130 favorites vs the Mariners
  • Astros vs Mariners Over / Under today: 7.5 Runs
  • Astros / Mariners TV Channel: SCHN | RTNW

The Houston Astros (-130) visit T-Mobile Park to take on the Seattle Mariners (+110) on Wednesday, April 9, 2025. First pitch is scheduled for 4:10pm EDT in Seattle, WA.

This season, the Astros are 4-6 against the spread (ATS), while the Mariners are 4-7 ATS.

Astros vs Mariners Starting Pitchers Today:

  • Astros starting pitcher: Hunter Brown 1-1, 2.92 ERA
  • Mariners starting pitcher: Luis Castillo 0-0, 8.11 ERA

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

SpreadOver / UnderMoneyline
Astros-1.5 +140O 7.5 -118-130
Mariners +1.5 -170U 7.5 -102+110

Astros vs Mariners Prediction for Today’s Game

Based on recent trends the model predicts the Astros will win Wednesday‘s MLB game with 53.9% 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 Astros players for Wednesday‘s game, looking at profitable historical betting trends:

Best Astros Player Prop Bets Today:

  • Hunter Brown has hit the Pitching Outs Over in 22 of his last 25 games (+19.35 Units / 56% ROI)
  • Hunter Brown has hit the Earned Runs Under in 20 of his last 25 games (+15.15 Units / 46% ROI)
  • Hunter Brown has hit the Walks Allowed Under in his last 7 away games (+7.75 Units / 70% ROI)
  • Hunter Brown has hit the Hits Allowed Under in 11 of his last 15 games (+6.80 Units / 34% ROI)
  • Hunter Brown has hit the Strikeouts Over in 15 of his last 25 games (+4.55 Units / 16% 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:

  • Jorge Polanco has hit the Singles Over in his last 6 games (+9.55 Units / 159% ROI)
  • Jorge Polanco has hit the Home Runs Over in 2 of his last 6 games (+6.80 Units / 113% ROI)
  • Jorge Polanco has hit the RBIs Over in 4 of his last 5 games at home (+6.45 Units / 129% ROI)
  • Jorge Polanco has hit the Hits Over in his last 6 games (+6.00 Units / 71% ROI)
  • Jorge Polanco has hit the Total Bases Over in his last 6 games (+6.00 Units / 71% ROI)
  • The Houston Astros have hit the Game Total Under in 85 of their last 146 games (+21.85 Units / 14% ROI)
  • The Houston Astros have hit the 1st Five Innings (F5) Moneyline in 30 of their last 51 games (+16.20 Units / 20% ROI)
  • The Houston Astros have covered the 1st Five Innings (F5) Run Line in 73 of their last 124 games (+14.95 Units / 10% ROI)
  • The Houston Astros have covered the Run Line in 58 of their last 105 games (+13.15 Units / 10% ROI)
  • The Houston Astros have hit the Moneyline in 28 of their last 45 away games (+9.20 Units / 17% ROI)
  • The Seattle Mariners have hit the Game Total Over in 34 of their last 58 games (+14.30 Units / 22% ROI)
  • The Seattle Mariners have hit the Moneyline in 45 of their last 71 games at home (+10.60 Units / 11% ROI)
  • The Seattle Mariners have covered the Run Line in 15 of their last 23 games (+8.95 Units / 31% ROI)
  • The Seattle Mariners have hit the Team Total Over in 15 of their last 21 games at home (+8.35 Units / 32% ROI)
  • The Seattle Mariners have hit the 1st Five Innings (F5) Moneyline in 18 of their last 31 games (+7.60 Units / 17% ROI)

Astros Against the Spread (ATS) Record

Against the spread this season, the Astros are 4-6 against the Run Line (-2.65 Units / -18.79% ROI).

  • 4-6 when betting on the Moneyline for -2.85 Units / -24.78% ROI
  • 3-5 when betting on the total runs Over for -2.75 Units / -24.44% ROI
  • 5-3 when betting on the total runs Under for +1.65 Units / 15.35% ROI

Mariners Against the Spread (ATS) Record

Against the spread this season, the Mariners are 4-7 against the Run Line (-3.7 Units / -25.43% ROI).

  • 4-7 when betting on the Moneyline for -5.05 Units / -33.22% ROI
  • 3-6 when betting on the total runs Over for -3.65 Units / -30.17% ROI
  • 6-3 when betting on the total runs Under for +2.7 Units / 22.22% ROI

Mariners vs Astros Home Run Prop Bets Today

Over Under
Yordan Alvarez (HOU) 0.5 +230 0.5 -295
Christian Walker (HOU) 0.5 +375 0.5 -500
Cal Raleigh (SEA) 0.5 +400 0.5 -550
Julio Rodriguez (SEA) 0.5 +475 0.5 -650
Jorge Polanco (SEA) 0.5 +550 0.5 -800

Mariners vs Astros Total Hits Prop Bets Today

Over Under
Yordan Alvarez (HOU) 0.5 -250 0.5 +180
Julio Rodriguez (SEA) 0.5 -235 0.5 +175
Yainer Diaz (HOU) 0.5 -225 0.5 +175
Jose Altuve (HOU) 0.5 -225 0.5 +170
Jeremy Pena (HOU) 0.5 -210 0.5 +155

Mariners vs Astros RBI Prop Bets Today

Over Under
Yordan Alvarez (HOU) 0.5 +125 0.5 -160
Christian Walker (HOU) 0.5 +155 0.5 -210
Yainer Diaz (HOU) 0.5 +175 0.5 -235
Cal Raleigh (SEA) 0.5 +190 0.5 -250
Jeremy Pena (HOU) 0.5 +200 0.5 -275

Mariners vs Astros Strikeout Prop Bets Today

Over Under
Luis F. Castillo (SEA) 3.5 -135 3.5 +105
Hunter Brown (HOU) 7.5 +135 7.5 -175

Opponents batted just .123 (45-for-367) against Hunter Brown with two-strikes in the 2024 season — 4th best among qualified SPs in MLB; League Avg: .163 — 94th Percentile.

Opponents have a Hard-Hit Rate of just 29% (69/237) against Hunter Brown on fastballs since last season — best among qualified SPs in MLB; League Avg: 44% — 100th Percentile.

Opponents are hitting .389 (7-for-18) against Hunter Brown when going through the lineup the first time in a game this season — 3rd highest among qualified SPs in MLB; League Avg: .217 — third Percentile.

Opponents have a swing rate of just 16% (7/45) against Hunter Brown on the first pitch of at-bats this season — 2nd lowest among among AL Starters; League Avg: 34% — fourth Percentile.

Mariners Starting Pitcher Stats & Trends

Luis Castillo has limited playing time.

Astros Keys to the Game vs. the Mariners

The Astros were just 0-56 (.000) when trailing entering the 9th inning in the 2024 season — tied for lowest in MLB; League Avg: .050.

The Astros are 67-10 (.870) when scoring 5 or more runs since last season — 5th best in MLB; League Avg: .805.

The Astros are 96-70 (.578) on the road since the 2023 season — 2nd best in MLB; League Avg: .475.

The Astros are just 13-23 (.361) when tied entering the 8th inning since the 2023 season — 3rd lowest in MLB; League Avg: .500.

Mariners Keys to the Game vs. the Astros

The Mariners were 58-5 (.921) when they scored 5 or more runs in the 2024 season — best in MLB; League Avg: .804.

The Mariners are just 8-35 (.186) when allowing 10 or more hits since last season — 4th lowest in MLB; League Avg: .249.

The Mariners are 77-16 (.828) when they’ve had 10 or more hits since the 2023 season — tied for 2nd best in MLB; League Avg: .739.

The Mariners are just 8-15 (.348) when tied entering the 8th inning since last season — 5th lowest in MLB; League Avg: .500.

Astros hitters are slugging just .091 against LHP this season — lowest in MLB; League Avg: .379.

Astros hitters have an OPS of just .258 (13 PA’s) against LHP this season — lowest in MLB; League Avg: .688.

Astros hitters do not have an extra-base hit out of 1 total hit against LHP this season — lowest in MLB; League Avg: 36%.

Astros hitters averaged just 3.65 pitches per plate appearance against RHP in the 2024 season — lowest in MLB; League Avg: 3.89.

The Mariners are batting just .203 when facing the starting pitcher for the 3rd time in a game since last season — lowest in MLB; League Avg: .261.

The Mariners are batting just .225 when facing the starting pitcher for the 3rd time in a game since the 2023 season — lowest in MLB; League Avg: .264.

The Mariners are batting just .140 with two-strikes since last season — lowest in MLB; League Avg: .168.

The Mariners batted just .207 when facing the starting pitcher for the 3rd time in a game in the 2024 season — lowest in MLB; League Avg: .263.

Astros pitchers have a strikeout rate of 30% this season — best in MLB; League Avg: 23%.

Astros pitchers have a strikeout rate of 33% versus hitters not batting 3-4-5 in the order this season — best in MLB; League Avg: 23%.

Opponents have a miss rate of 28% against Astros pitchers since last season — 2nd best in MLB; League Avg: 25%.

Astros pitchers have a strikeout rate of 33% with runners in scoring position this season — tied for best in MLB; League Avg: 22%.

Mariners pitchers walked 76 of 1,441 batters (5%) when facing the leadoff batter in the inning in the 2024 season — best in MLB; League Avg: 7%.

Mariners pitchers have walked 411 of 6,275 batters (7%) since last season — best in MLB; League Avg: 8%.

Mariners pitchers walked 369 of 5,801 batters (6%) in the 2024 season — best in MLB; League Avg: 8%.

Mariners pitchers allowed an OBP of just .251 (1,441 PA’s) when facing the leadoff batter in the inning in the 2024 season — best in MLB; League Avg: .305.

More MLB Reading:


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Our BetMGM betting authors are experts who focus on individual game matchups & player prop bets with an emphasis on betting odds, lines & predictions.

Our BetMGM betting authors are experts who focus on individual game matchups & player prop bets with an emphasis on betting odds, lines & predictions.