Mariners vs Astros Prediction, Odds, Moneyline, Spread & Over/Under for July 20

Odds updated as of 1:11 a.m.

The MLB's Sunday schedule includes the Seattle Mariners taking on the Houston Astros.

Here's what you need to know before checking out today's MLB odds and spreads on FanDuel Sportsbook.

Mariners vs Astros Game Info

• Seattle Mariners (52-45) vs. Houston Astros (56-41)
• Date: Sunday, July 20, 2025
• Time: 4:10 p.m. ET
• Venue: T-Mobile Park -- Seattle, Washington
• Coverage: ROOT Sports NW and SCHN

Mariners vs Astros Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-132) | HOU: (+112)
• Spread: SEA: -1.5 (+152) | HOU: +1.5 (-184)
• Total: 8 -- Over: (-110) | Under: (-110)

Mariners vs Astros Probable Starting Pitchers

Probable Pitchers: Bryan Woo (Mariners) - 8-4, 2.59 ERA vs Hunter Brown (Astros) - 9-4, 2.43 ERA

The probable starters are Bryan Woo (8-4) for the Mariners and Hunter Brown (9-4) for the Astros. When Woo starts, his team is 8-10-0 against the spread this season. Woo's team has been victorious in 58.3% of the games he's started as the moneyline favorite with a record of 7-5. The Astros have an 11-8-0 ATS record in Brown's 19 starts with a set spread. The Astros are 2-1 in Brown's three starts this season that they were the moneyline underdog.

Mariners vs Astros Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Astros win (57.5%)

Mariners vs Astros Moneyline

• Seattle is the favorite, -132 on the moneyline, while Houston is a +112 underdog on the road.

Mariners vs Astros Spread

• The Mariners are favored by 1.5 runs at home against the Astros. The Mariners are +152 to cover the spread, while the Astros are -184.

Mariners vs Astros Over/Under

• A total of 8 runs has been set for the Mariners-Astros game on July 20, with the over available at -110 and the under at -110.

Bet on Seattle Mariners vs. Houston Astros on FanDuel today!

Mariners vs Astros Betting Trends

• The Mariners have won in 34, or 56.7%, of the 60 contests they have been named as odds-on favorites in this year.
• This year Seattle has won 22 of 39 games when listed as at least -132 on the moneyline.
• The Mariners' games have gone over the total in 51 of their 94 opportunities.
• The Mariners are 42-52-0 against the spread in their 94 games with a line set by sportsbooks this season.
• The Astros have won 17 of the 28 games they were listed as the moneyline underdog this season (60.7%).
• Houston has gone 9-5 when it has played as a moneyline underdog with odds of +112 or longer (64.3%).
• The Astros have played in 96 games with an over/under set, and have combined with their opponents to go over the total 40 times (40-54-2).
• The Astros have a 48-48-0 record ATS this season.

Mariners Player Leaders

• Cal Raleigh has 91 hits, which is best among Seattle hitters this season, while batting .259 with 54 extra-base hits. He has an on-base percentage of .375 and a slugging percentage of .630.
• Among qualifying batters, he is 78th in batting average, his on-base percentage ranks 17th, and he is second in slugging.
• Julio Rodriguez is hitting .251 with 17 doubles, three triples, 14 home runs and 30 walks. He's slugging .415 with an on-base percentage of .315.
• Among all qualifying players, he ranks 95th in batting average, 109th in on-base percentage and 89th in slugging percentage.
• Randy Arozarena has collected 89 base hits, an OBP of .358 and a slugging percentage of .470 this season.
• Arozarena brings a three-game hitting streak into this matchup. During his last five outings he is batting .333 with a double, three home runs, three walks and five RBIs.
• J.P. Crawford is slashing .289/.390/.390 this season and leads the Mariners with an OPS of .779.
• Crawford has safely hit in 15 straight games. In his last 10 outings he is hitting .325 with three doubles, a home run, five walks and seven RBIs.

Astros Player Leaders

• Isaac Paredes is hitting .258 with 15 doubles, a triple, 19 home runs and 49 walks. He's slugging .470 with an on-base percentage of .359.
• He ranks 83rd in batting average, 36th in on-base percentage and 42nd in slugging percentage among all qualifying hitters in the majors.
• Jose Altuve is hitting .274 with 14 doubles, a triple, 17 home runs and 33 walks. He's slugging .460 with an on-base percentage of .333.
• Including all qualifying hitters, he ranks 49th in batting average, 73rd in on-base percentage and 52nd in slugging percentage.
• Yainer Diaz is batting .243 with 11 doubles, a triple, 13 home runs and 14 walks.
• Cam Smith is hitting .274 with 16 doubles, two triples, seven home runs and 27 walks.

Mariners vs Astros Head to Head

• 7/18/2025: 6-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -142, Underdog Moneyline: +120)
• 5/25/2025: 5-3 HOU (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -138, Underdog Moneyline: +118)
• 5/24/2025: 2-1 HOU (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 5/23/2025: 5-3 SEA (Favorite: Astros, Spread: -1.5, Total: 8.5, Favorite Moneyline: -116, Underdog Moneyline: -102)
• 5/22/2025: 9-2 HOU (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -132, Underdog Moneyline: +112)
• 4/9/2025: 7-6 SEA (Favorite: Astros, Spread: -1.5, Total: 7.5, Favorite Moneyline: -142, Underdog Moneyline: +120)
• 4/8/2025: 2-1 HOU (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -120, Underdog Moneyline: +102)
• 4/7/2025: 4-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -158, Underdog Moneyline: +134)
• 9/25/2024: 8-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -148, Underdog Moneyline: +126)
• 9/24/2024: 4-3 HOU (Favorite: Astros, Spread: -1.5, Total: 7, Favorite Moneyline: -130, Underdog Moneyline: +110)

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