MLB Prop Bets: Houston Astros vs Seattle Mariners (May 12, 2026)
The Seattle Mariners (20-22) face the Houston Astros (16-26) at Daikin Park on Tuesday at 8:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Bryan Woo is the probable pitcher for the Mariners, while Tatsuya Imai is the probable pitcher for the Astros. The Mariners are favored to win at -156, while the Astros are at +129. The total runs line is set at 8.5, with OVER at -120 and UNDER at +100.
- The Mariners (+109) have a 17-25 Run Line record this season, while the Astros (-131) hold a record of 16-26.
- The Mariners have an 18-23-1 O/U record this season (meaning 18 games have gone over the total runs line, 23 have gone under and one has resulted in a push). The Astros have a 26-15-1 O/U record.
Scoring Insights
- The Mariners are averaging 4.0 runs per game this season (25th in the league). Comparatively, the Astros are averaging +0.6 more at 4.7 runs (9th).
- In the field, the Mariners are allowing 4.0 runs per game this season (7th in the league), while the Astros are allowing an average of 5.5 runs (29th).
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 Astros are at an impressive .258 (ranking 3rd in the Major leagues), while the Mariners are batting an underwhelming .229 (27th).
Home Runs
- In terms of total home runs this season, the Astros have hit 52 (5th in the Major Leagues). Meanwhile, the Mariners have managed 47 (10th).
Runs Batted In
- Finally, looking at their runs batted in, the Mariners have recorded 165 RBIs to rank 20th in the MLB this season. Comparatively, the Astros have recorded 187 RBIs to rank T7th.
Pitching Insights:
Earned Run Average
- The Astros have an earned run average of 5.50 this season (30th in the Majors), while The Mariners have an ERA of 3.71 (7th).
Strikeouts
- Turning our attention to total strikeouts, the Mariners have recorded 358 this season, ranking 12th in the MLB. Meanwhile, the Astros rank 4th for total strikeouts, recording 370.
Opponent Batting Average
- Opponents are batting an average of .262 against the Astros this season (27th in the Major Leagues). Comparatively, the Mariners' opponents are at .255 (25th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 10-12-20 | 8-8-7 | 2-4-13 | 10-11-16 | 0-1-4 | 0-0-0 | 2-4-4 |
| Astros | 15-11-16 | 9-4-7 | 6-7-9 | 4-4-8 | 11-7-8 | 0-0-0 | 3-0-7 |
Lead After Three Innings
The Mariners are -130 to lead after three innings, while the Astros are +100.
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 17-15-10 | 11-8-4 | 6-7-6 | 14-14-9 | 3-1-1 | 0-0-0 | 5-3-2 |
| Astros | 15-15-12 | 8-8-4 | 7-7-8 | 6-6-4 | 9-9-8 | 0-0-0 | 3-4-3 |
NRFI/YRFI
The NRFI market is paying -130 and the YRFI is paying +100.
- The NRFI is 17-25 in Mariners games this season. The Astros have a 15-27 NRFI record.
Last Time They Met
The Mariners recorded a 3-1 victory over the Astros at Daikin Park yesterday. Julio Rodriguez was unstoppable in that matchup, hitting a home run, a single and recording an RBI. The Mariners have now won eight straight against the Astros.
