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

Odds updated as of 1:12 a.m.

On Saturday in MLB, the Houston Astros are playing 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: (-118) | SEA: (+100)
• Spread: HOU: +1.5 (-205) | SEA: -1.5 (+168)
• Total: 8.5 -- Over: (-110) | Under: (-110)

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 Astros will give the nod to Hayden Wesneski (2-0) versus the Mariners and Emerson Hancock (6-7). Wesneski and his team have covered in each of the three games he's started with a spread this season. Wesneski's team has won each of the three games he's started as the moneyline favorite. The Mariners have a 7-15-0 ATS record in Hancock's 22 starts with a set spread. The Mariners have been the moneyline underdog in four of Hancock's starts this season, and they went 2-2 in those matchups.

Astros vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Astros win (53%)

Astros vs Mariners Moneyline

• Looking at the moneyline for Astros-Mariners, Houston is the favorite at -118, and Seattle is +100 playing on the road.

Astros vs Mariners Spread

• The Mariners are 1.5-run favorites against the spread for this matchup with the Astros. The Mariners are +168 to cover, while the Astros are -205 to cover as a 1.5-run underdog on the runline.

Astros vs Mariners Over/Under

• The over/under for the Astros versus Mariners contest on Aug. 15 has been set at 8.5, with -110 odds on the over and -110 odds on the under.

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

Astros vs Mariners Betting Trends

• The Astros have been favorites in 49 games this season and have come away with the win 26 times (53.1%) in those contests.
• This year Houston has won 19 of 40 games when listed as at least -118 on the moneyline.
• Contests with the Astros have gone over the total set by oddsmakers in 66 of 123 chances this season.
• In 123 games with a line this season, the Astros have a mark of 61-62-0 against the spread.
• The Mariners have won 28.6% of the games this season they were the underdog on the moneyline (6-15).
• Seattle has a record of 3-9 in games it has played as a moneyline underdog with odds of +100 or longer (25%).
• The Mariners have played in 122 games with an over/under set, and have combined with opponents to go over the total 59 times (59-57-6).
• The Mariners have a 42-80-0 record against the spread this season.

Astros Player Leaders

• Yordan Alvarez leads Houston in OBP (.437), slugging percentage (.626) and total hits (142) this season. He has a .323 batting average.
• Among qualified hitters in MLB, his batting average ranks first, his on-base percentage ranks first, and he is first in slugging.
• Alvarez hopes to build on a two-game hitting streak in this matchup. During his last five outings he is batting .294 with a double, a home run, three walks and two RBIs.
• Isaac Paredes is batting .255 with 21 doubles, a triple, 15 home runs and 46 walks. He's slugging .415 with an on-base percentage of .347.
• Among all qualifying hitters, he ranks 72nd in batting average, 50th in on-base percentage and 83rd in slugging percentage.
• Christian Walker has 104 hits this season and has a slash line of .238/.317/.455.
• Jeremy Pena is batting .289 with a .346 OBP and 39 RBI for Houston this season.
• Pena has hit safely in two straight games. In his last five games he is hitting .130 with a double and two RBIs.

Mariners Player Leaders

• Randy Arozarena has accumulated a team-high OBP (.372) and slugging percentage (.455), while leading the Mariners in hits (118, while batting .278).
• He ranks 30th in batting average, 14th in on-base percentage and 41st in slugging percentage among all qualified hitters in the majors.
• Arozarena takes a four-game hitting streak into this matchup. During his last five outings he is hitting .263 with a double, two home runs, two walks and three RBIs.
• Josh Naylor is hitting .266 with 18 doubles, 10 home runs and 39 walks. He's slugging .375 with an on-base percentage of .331.
• He is currently 48th in batting average, 77th in on-base percentage and 121st in slugging percentage among all qualified batters.
• Julio Rodriguez has 17 doubles, 19 home runs and 40 walks while batting .257.
• Cole Young is hitting .258 with 15 doubles, three triples, 14 home runs and 31 walks.

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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