MLB Prop Bets: Houston Astros vs Seattle Mariners (August 15, 2026)
The Seattle Mariners (57-66) face the Houston Astros (63-60) at Daikin Park on Saturday at 7:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Emerson Hancock is the probable pitcher for the Mariners, while Hayden Wesneski is the probable pitcher for the Astros. The Astros are favored to win at -125, while the Mariners are at +104. The total runs line is set at 8.5, with OVER at -105 and UNDER at -115.
- The Mariners (-195) have a 47-76 Run Line record this season, while the Astros (+160) hold a record of 64-59.
- The Mariners have a 59-56-8 O/U record this season (meaning 59 games have gone over the total runs line, 56 have gone under and eight have resulted in a push). The Astros have a 65-51-7 O/U record.
Scoring Insights
- The Mariners are averaging 3.9 runs per game this season (30th in the league). Comparatively, the Astros are averaging +0.8 more at 4.6 runs (10th).
- In the field, the Mariners are allowing 4.1 runs per game this season (8th in the league), while the Astros are allowing an average of 4.8 runs (25th).
Let's take a look at how these teams perform in some other key statistical areas.
Batting Insights:
Batting Average
- Looking at their batting averages this season, the Mariners are at .229 (ranking 29th in the Major leagues), while the Astros are batting .244 (13th).
Home Runs
- In terms of total home runs this season, the Astros have hit 164 (T3rd in the Major Leagues). Meanwhile, the Mariners have managed 142 (16th).
Runs Batted In
- Finally, looking at their runs batted in, the Mariners have recorded 460 RBIs to rank 30th in the MLB this season. Comparatively, the Astros have recorded 542 RBIs to rank 10th.
Pitching Insights:
Earned Run Average
- The Astros have an earned run average of 4.55 this season (25th in the Majors), while The Mariners have an ERA of 3.85 (8th).
Strikeouts
- Turning our attention to total strikeouts, the Mariners have recorded 1043 this season, ranking 12th in the MLB. Meanwhile, the Astros rank 10th for total strikeouts, recording 1072.
Opponent Batting Average
- Opponents are batting an average of .238 against the Astros this season (9th in the Major Leagues). Comparatively, the Mariners' opponents are at .245 (17th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 28-30-65 | 17-14-31 | 11-16-34 | 25-23-51 | 3-7-14 | 0-0-0 | 3-1-6 |
| Astros | 34-33-56 | 18-13-29 | 16-20-27 | 13-13-24 | 21-20-32 | 0-0-0 | 1-3-6 |
Lead After Three Innings
The Mariners are +100 to lead after three innings, while the Astros are -130.
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 48-46-29 | 28-20-14 | 20-26-15 | 38-36-25 | 10-10-4 | 0-0-0 | 4-4-2 |
| Astros | 44-50-29 | 26-21-13 | 18-29-16 | 19-21-10 | 25-29-19 | 0-0-0 | 5-3-2 |
NRFI/YRFI
The NRFI market is paying -115 and the YRFI is paying -115.
- The NRFI is 60-63 in Mariners games this season. The Astros have a 53-70 NRFI record.
Last Time They Met
The Astros recorded a 10-7 extra innings victory over the Mariners at Daikin Park yesterday. Christian Walker was unstoppable in that matchup, hitting a home run, a single and recording 3 RBIs.
