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

Odds updated as of 3:11 p.m.

On Sunday in MLB, the Seattle Mariners are playing the Houston Astros.

Before checking out the MLB betting lines on FanDuel Sportsbook, we've got you covered, in terms of the most important information regarding this game.

Mariners vs Astros Game Info

• Seattle Mariners (53-45) vs. Houston Astros (56-42)
• 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: (-142) | HOU: (+120)
• Spread: SEA: -1.5 (+168) | HOU: +1.5 (-205)
• Total: 6.5 -- 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

This contest's pitching matchup is set, as the Mariners will send Bryan Woo (8-4) to the mound, while Hunter Brown (9-4) will get the nod for the Astros. Woo's team is 8-10-0 against the spread in his starts this season. Woo's team has a record of 7-5 this season when he starts and they are the favorite on the moneyline. When Brown starts, the Astros have gone 11-8-0 against the spread. The Astros are 2-1 in Brown's three starts this season that they were the underdog on the moneyline.

Mariners vs Astros Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Astros win (51.8%)

Mariners vs Astros Moneyline

• Seattle is a -142 favorite on the moneyline, while Houston is a +120 underdog on the road.

Mariners vs Astros Spread

• The Astros are at +1.5 on the runline against the Mariners. The Astros are -205 to cover the spread, and the Mariners are +168.

Mariners vs Astros Over/Under

• A total of 6.5 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 35, or 57.4%, of the 61 contests they have been named as odds-on favorites in this year.
• Seattle has a record of 17-11 when favored by -142 or more this year.
• The Mariners and their opponents have gone over in 52 of their 95 games with a total set by sportsbooks this season.
• The Mariners have posted a record of 42-53-0 against the spread this season.
• The Astros have a 17-12 record in games they were the underdog on the moneyline (winning 58.6% of those games).
• Houston has a 6-1 record (winning 85.7% of its games) when playing as a moneyline underdog of +120 or longer.
• In the 97 games oddsmakers have set an over/under for the Astros, they have combined with opponents to go over the total 41 times (41-54-2).
• The Astros have a 49-48-0 record against the spread this season.

Mariners Player Leaders

• Cal Raleigh leads Seattle in total hits (91) this season while batting .256 with 54 extra-base hits. He has an on-base percentage of .371 and a slugging percentage of .621.
• Among qualified hitters in the majors, his batting average ranks 86th, his on-base percentage ranks 20th, and he is second in slugging.
• Julio Rodriguez has 17 doubles, three triples, 14 home runs and 30 walks. He's batting .250 and slugging .413 with an on-base percentage of .314.
• Among qualified hitters, he is 100th in batting average, 110th in on-base percentage and 89th in slugging percentage.
• Randy Arozarena has collected 91 base hits, an OBP of .361 and a slugging percentage of .473 this season.
• Arozarena has recorded a hit in four games in a row. In his last five games he is hitting .381 with two doubles, three home runs, three walks and five RBIs.
• J.P. Crawford has a slash line of .286/.387/.385 this season and a team-best OPS of .773.

Astros Player Leaders

• Jose Altuve has put up a slugging percentage of .464, a team-best for the Astros. He's batting .279 with an on-base percentage of .337.
• Including all qualified hitters, he is 40th in batting average, while his on-base percentage ranks 67th and he is 48th in slugging.
• Isaac Paredes is hitting .259 with 15 doubles, a triple, 19 home runs and 49 walks. He's slugging .470 with an on-base percentage of .359.
• He is currently 78th in batting average, 37th in on-base percentage and 43rd in slugging percentage among all qualified hitters.
• Yainer Diaz is hitting .242 with 11 doubles, a triple, 13 home runs and 14 walks.
• Cam Smith is batting .272 with 16 doubles, two triples, seven home runs and 27 walks.

Mariners vs Astros Head to Head

• 7/19/2025: 7-6 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -132, Underdog Moneyline: +112)
• 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)

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