The Houston Astros (77-79) and the Seattle Mariners (73-83) open a 2-game AL West series Tuesday at T-Mobile Park in Seattle, Washington. First pitch is scheduled for 9:40 p.m. ET. Let's analyze MLB odds around the Astros vs. Mariners odds and make our expert MLB picks and predictions for the best bets.
Season series: Mariners lead 9-2; Seattle is 4-0 at home in 2026
The Astros open the series a game back of the Texas Rangers for first place in the AL West Division, while the Mariners are 5 games back of Texas, so mathematically alive for the division still. The Astros are also 3 games back of the Chicago White Sox for the final Wild Card spot in the AL, while the Mariners are 7 games back, and therefore cannot qualify for the Wild Card. It's
division title or bust for Seattle, if it wants to make the playoffs, and there is a 0.1% chance it is a playoff team.
Houston was swept at home over the weekend by the Atlanta Braves, and it is 2-7 in the past 9 games, and it has dropped 6 in a row against teams headed for the playoffs. The Under is 4-1-1 in the past 6 games, and 13-4-1 in the previous 18 outings. The Astros are 1-4 in the past 5 games on the road, and the Under is 3-1 in the past 4 away from home.
Seattle has kept its flickering playoff hopes alive with 3 wins in the past 4 games, while going 7-6 in the past 13 outings while the other contenders in the division have struggled. The Under has cashed in 3 in a row, while going 2-1-1 in the past 4 at home.
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Astros at Mariners projected starters
RHP Cristian Javier vs. RHP Logan Gilbert
Javier (2-6, 5.31 ERA) makes his 12th start (17th appearance). He has a 1.46 WHIP, 3.8 BB/9, 8.4 K/9 in 61 innings.
- Last start: Loss, 5 1/3 IP, 2 ER, 5 H, 1 HR, 3 BB, 2 K in 5-2 home loss vs. Kansas City Royals Wednesday
- September 2026 splits (3 starts): 1-1, 2.20 ERA (16 1/3 IP, 4 ER), 0.98 WHIP, 2 HR, 7 BB, 15 K
- 2026 road splits (5 starts, 8 appearances): 1-3, 5.59 ERA (29 IP, 18 ER), 1.59 WHIP, 2 HR, 12 BB, 25 K
- Career vs. Mariners (6 starts, 9 appearances): 3-2, 2.87 (37 2/3 IP, 12 ER), 1.09 WHIP, 1 HR, 20 BB, 37 K
Gilbert (12-10, 3.69 ERA) makes his 31st start. He has a 1.06 WHIP, 2.3 BB/9, 9.8 K/9 in 178 innings.
- Last start: Loss, 6 IP, 2 ER, 6 H, 1 HR, 2 BB, 7 K in 2-1 loss at Los Angeles Angels last Tuesday
- September 2026 splits (3 starts): 1-2, 6.11 ERA (17 2/3 IP, 12 ER), 1.30 WHIP, 6 HR, 6 BB, 28 K
- 2026 home splits (17 starts): 9-5, 4.41 ERA (102 IP, 50 ER), 1.04 WHIP, 24 HR, 27 BB, 120 K
- Career vs. Astros (15 starts): 7-4, 3.18 ERA (90 2/3 IP, 32 ER), 1.02 WHIP, 15 HR, 19 BB, 80 K, 7.9 K/9
Astros at Mariners odds
Provided by BetMGM Sportsbook; access USA TODAY Sports Scores and Sports Betting Odds hub for a full list. Lines last updated at 3:01 p.m. ET.
- Moneyline (ML): Astros +115 (bet $100 to win $115) | Mariners -140 (bet $140 to win $100)
- Run line (RL)/Against the spread (ATS): Astros +1.5 (-185) | Mariners -1.5 (+150)
- Over/Under (O/U): 7.5 (O: +100 | U: -120)
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Astros at Mariners picks and predictions
Prediction
Mariners 4, Astros 3
Moneyline
The MARINERS (-140) should be able to stay alive for at least another day, as Gilbert has pitched well at home, although his September numbers have been brutal. Gilbert surrenders so many homers, too, and that's dangerous, so tread lightly.
Run line/Against the spread
The Astros +1.5 (-185) will cost you nearly 2 times your potential return, if you some insurance, and that's just a little too expensive.
AVOID, and back Houston straight up if you don't trust Seattle.
Over/Under
UNDER 7.5 (-120) is a low number, but this should have a playoff-like feel in Seattle Tuesday night.
And, Houston has really struggled to plate runs, going for 2.8 runs per game across the past 10 outings, and the Under is, again, 7-2-1 in the past 10 games, and 13-4-1 across the previous 18 outings. Meanwhile, Seattle has cashed low in 3 in a row. The Under is 2-1-1 in Gilbert's past 4 outings, too.
Betting odds calculator
For more sports betting picks and tips, check out SportsbookWire.com and BetFTW. Follow Daniel Dobish on X at @danieledobish. Follow SportsbookWire on X at SportsBookWire and on Facebook.
This article originally appeared on Sportsbook Wire: Houston Astros at Seattle Mariners odds, picks and predictions
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