MLB Prop Bets: Houston Astros vs Seattle Mariners (May 13, 2026)
The Seattle Mariners (21-22) face the Houston Astros (16-27) at Daikin Park on Wednesday at 8:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Bryce Miller is the probable pitcher for the Mariners, while Lance McCullers Jr. is the probable pitcher for the Astros. The Mariners are favored to win at -126, while the Astros are at +104. The total runs line is set at 9.0, with OVER at -118 and UNDER at -102.
- The Mariners (+129) have an 18-25 Run Line record this season, while the Astros (-156) hold a record of 16-27.
- The Mariners have a 19-23-1 O/U record this season (meaning 19 games have gone over the total runs line, 23 have gone under and one has resulted in a push). The Astros have a 27-15-1 O/U record.
Scoring Insights
- The Mariners are averaging 4.2 runs per game this season (21st in the league). Comparatively, the Astros are averaging +0.4 more at 4.6 runs (10th).
- In the field, the Mariners are allowing only 3.9 runs per game this season (6th in the league), while the Astros are allowing an average of 5.7 runs (30th).
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 .231 (ranking 24th in the Major leagues), while the Astros are batting .255 (4th).
Home Runs
- In terms of total home runs this season, the Astros have hit 52 (T6th in the Major Leagues). Meanwhile, the Mariners have managed 49 (11th).
Runs Batted In
- Finally, looking at their runs batted in, the Mariners have recorded 175 RBIs to rank T13th in the MLB this season. Comparatively, the Astros have recorded 189 RBIs to rank 8th.
Pitching Insights:
Earned Run Average
- The Astros have an earned run average of 5.61 this season (30th in the Majors), while The Mariners have an ERA of 3.67 (8th).
Strikeouts
- Turning our attention to total strikeouts, the Mariners have recorded 370 this season, ranking 10th in the MLB. Meanwhile, the Astros rank T7th for total strikeouts, recording 374.
Opponent Batting Average
- Opponents are batting an average of .263 against the Astros this season (27th in the Major Leagues). Comparatively, the Mariners' opponents are at .253 (24th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 10-12-21 | 8-8-7 | 2-4-14 | 10-11-17 | 0-1-4 | 0-0-0 | 2-3-5 |
| Astros | 15-11-17 | 9-4-8 | 6-7-9 | 4-4-8 | 11-7-9 | 0-0-0 | 3-0-7 |
Lead After Three Innings
The Mariners are -125 to lead after three innings, while the Astros are -105.
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 17-15-11 | 11-8-4 | 6-7-7 | 14-14-10 | 3-1-1 | 0-0-0 | 5-2-3 |
| Astros | 15-15-13 | 8-8-5 | 7-7-8 | 6-6-4 | 9-9-9 | 0-0-0 | 3-3-4 |
NRFI/YRFI
The NRFI market is paying -110 and the YRFI is paying -120.
- The NRFI is 18-25 in Mariners games this season. The Astros have a 16-27 NRFI record.
Last Time They Met
The Mariners recorded a lopsided 10-2 victory against the Astros at Daikin Park yesterday. Randy Arozarena was unstoppable in that matchup, hitting a home run, a single and recording 3 RBIs. The Mariners have now won nine straight against the Astros.
