Astros vs Mariners Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 15

Odds updated as of 6:13 p.m.

In MLB action on Saturday, the Houston Astros take on the Seattle Mariners.

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

Astros vs Mariners Game Info

• Houston Astros (63-60) vs. Seattle Mariners (57-66)
• Date: Saturday, August 15, 2026
• Time: 7:10 p.m. ET
• Venue: Daikin Park -- Houston, Texas
• Coverage: SCHN and Mariners.TV

Astros vs Mariners Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: HOU: (-122) | SEA: (+112)
• Spread: HOU: -1.5 (+164) | SEA: +1.5 (-200)
• Total: 8 -- Over: (-115) | Under: (-105)

Astros vs Mariners Probable Starting Pitchers

Probable Pitchers: Hayden Wesneski (Astros) - 2-0, 3.86 ERA vs Emerson Hancock (Mariners) - 6-7, 3.35 ERA

The probable pitchers are Hayden Wesneski (2-0) for the Astros and Emerson Hancock (6-7) for the Mariners. Wesneski's team has covered the spread in each of the three opportunities this season. Wesneski and his team have won each of the three games he's started as the moneyline favorite. The Mariners have a 7-15-0 record against the spread in Hancock's starts. The Mariners are 2-2 in Hancock's four starts this season that they were the underdog on the moneyline.

Astros vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Astros win (52.7%)

Astros vs Mariners Moneyline

• Looking at the moneyline for Astros-Mariners, Houston is the favorite at -122, and Seattle is +112 playing on the road.

Astros vs Mariners Spread

• The Mariners are at +1.5 on the runline against the Astros. The Mariners are -200 to cover the spread, and the Astros are +164.

Astros vs Mariners Over/Under

• Astros versus Mariners, on Aug. 15, has an over/under of 8, with the over being -115 and the under -105.

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

Astros vs Mariners Betting Trends

• The Astros have come away with 26 wins in the 49 contests they have been listed as the favorites in this season.
• Houston has a record of 19-19 when favored by -122 or more this year.
• The Astros and their opponents have hit the over in 66 of their 123 games with a total set by oddsmakers this season.
• The Astros have an against the spread mark of 61-62-0 in 123 games with a line this season.
• The Mariners have won six of the 21 games they were listed as the moneyline underdog this season (28.6%).
• When it has played as a moneyline underdog with odds of +112 or longer, Seattle has a record of 3-5 (37.5%).
• The Mariners have had an over/under set by bookmakers 122 times, and have combined with opponents to go over the total in 59 of those games (59-57-6).
• The Mariners have covered just 34.4% of their games this season, going 42-80-0 ATS.

Astros Player Leaders

• Yordan Alvarez leads Houston with 142 hits and an OBP of .437, plus a team-best slugging percentage of .626. He's batting .323.
• He ranks first in batting average, first in on-base percentage, and first in slugging among all qualifying hitters in baseball.
• Alvarez has recorded at least one hit in two straight games. During his last five outings he is batting .294 with a double, a home run, three walks and two RBIs.
• Isaac Paredes has 21 doubles, a triple, 15 home runs and 46 walks. He's batting .255 and slugging .415 with an on-base percentage of .347.
• He is 71st in batting average, 50th in on-base percentage and 84th in slugging in the majors.
• Christian Walker is batting .238 with a .455 slugging percentage and 70 RBI this year.
• Jeremy Pena is batting .289 with a .346 OBP and 39 RBI for Houston this season.
• Pena brings a two-game hitting streak into this game. During his last five outings he is hitting .130 with a double and two RBIs.

Mariners Player Leaders

• Randy Arozarena has an on-base percentage of .372, a slugging percentage of .455, and has 118 hits, all club-highs for the Mariners (while batting .278).
• He is 29th in batting average, 15th in on-base percentage and 43rd in slugging percentage among all qualifying hitters in MLB.
• Arozarena hopes to build on a four-game hitting streak in this matchup. In his last five games he is batting .263 with a double, two home runs, two walks and three RBIs.
• Josh Naylor has 18 doubles, 10 home runs and 39 walks while hitting .266. He's slugging .375 with an on-base percentage of .331.
• Including all qualifying hitters, he ranks 49th in batting average, 77th in on-base percentage and 119th in slugging percentage.
• Julio Rodriguez is batting .257 with 17 doubles, 19 home runs and 40 walks.
• Cole Young has 15 doubles, three triples, 14 home runs and 31 walks while batting .258.

Astros vs Mariners Head to Head

• 8/14/2026: 10-7 HOU (Favorite: Astros, Spread: -1.5, Total: 8, Favorite Moneyline: -122, Underdog Moneyline: +112)
• 5/14/2026: 8-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 9, Favorite Moneyline: -112, Underdog Moneyline: -104)
• 5/13/2026: 4-3 HOU (Favorite: Mariners, Spread: -1.5, Total: 9, Favorite Moneyline: -136, Underdog Moneyline: +116)
• 5/12/2026: 10-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -200, Underdog Moneyline: +168)
• 5/11/2026: 3-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -154, Underdog Moneyline: +130)
• 4/13/2026: 6-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -178, Underdog Moneyline: +150)
• 4/12/2026: 6-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -190, Underdog Moneyline: +160)
• 4/11/2026: 8-7 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -152, Underdog Moneyline: +128)
• 4/10/2026: 9-6 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -136, Underdog Moneyline: +116)
• 9/21/2025: 7-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -148, Underdog Moneyline: +126)

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