Seattle Mariners vs. Houston Astros Picks and Prediction, Friday, September 19, 2025
Use Code WWWC On Friday, the Seattle Mariners will face the Houston Astros at Daikin Park, and we have you ready to go with our Mariners vs. Astros prediction. First pitch from H-Town is at 8:10 p.m. ET.
Houston is a -108 moneyline favorite, and the game total is 7.5 runs scored.
The series is tied 5-5 over the last ten matchups between these AL West rivals, and the over was 4-4-2 in those games. If you want the Mariners vs. Astros prediction, read on and check out our MLB Predictions to beat the sportsbooks!
Mariners need a strong showing by Woo
Seattle (84-69 SU, 66-87 RL, and 84-63-6 O/U) won two of three against Kansas City in its previous series. The Mariners are 9-1 in their last ten games (the over was 6-4).
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Seattle will turn to righty Bryan Woo tomorrow against Houston. In his last outing, the third-year MLB pro allowed two runs on three hits with 13 strikeouts in six innings against the Angels. He is 14-7 with a 3.02 ERA and 0.94 WHIP in 29 starts (181.2 IP) this season, including 4-5 with a 3.58 ERA and 1.08 WHIP in 15 road appearances (93.0 IP).
Seattle was among the most disappointing baseball teams last year, as it wasted a fantastic pitching rotation (2.85 ERA and a .205 OBA) with an inability to provide run support. The Mariners ranked 20th in runs scored in 2024, averaging 4.1 per game. Close losses were too common for M's fans, but they appear to have turned it around this year. Seattle has been more productive at the plate in 2025, ranking 10th in MLB in runs scored (4.75 per game), and has stayed competitive on the mound. Can they hold off Houston and win the AL West?
Seattle Mariners Baseball Injury Report: No new injuries for Friday's game against the Astros.
This is a must-win home series for Houston
Houston (84-69 SU, 75-78 RL, and 70-77-6 O/U) swept Texas in its previous series. The Astros are 6-4 in their last ten games (the under was 6-4).
Houston will start righty Hunter Brown on Friday night versus the Mariners. In his last appearance, the 27-year-old surrendered two runs and four hits in a 6.2-inning win against Atlanta. He is 12-7 with a 2.27 ERA and 1.00 WHIP in 29 starts (174.1 IP) this season, including 5-5 with a 2.25 ERA and 0.96 WHIP in 13 home outings (80.0 IP).
Injuries forced the Astros to be creative last year, as they used 12 starting pitchers and 32 pitchers overall. Still, they turned their season around after a poor start to win their seventh American League West crown in the last eight years. Expectations are still high in H-Town, as the Astros are tied for first place in the AL West. Can they sustain their success down the stretch to take down Seattle?
Houston Astros Baseball Injury Report: No new injuries to report for tomorrow's game against Seattle.
Mariners vs. Astros Pick
Moneyline Pick for Mariners vs. Astros
- Houston ML (4 Units)
The Astros have solid career numbers against Woo, with a .306 BA, .514 SLG, and .363 wOBA in 75 combined plate appearances. They scored five runs on six hits, including two homers, in their last appearance against him (July 20). Brown, on the other hand, has been more effective vs Seattle, holding current M's hitters to a .226 BA with a 34.1% strikeout percentage and 31.7% whiff percentage. He has held them to three total runs in two outings this season.
Seattle has more momentum heading into Friday's game, but Houston will come out on top in the series opener.
Over/Under Pick for Mariners vs. Astros
- Over 7.5 (5 Units)
Betting Trend: The over is 21-12 when the Mariners are road underdogs this year.
Seattle has been a consistent run producer in away games, ranking third in road scoring (5.13 runs per game). They haven't had much success against Brown this season, but if they can chase him from the game early, they'll have a shot against an Astros bullpen that has allowed 75 homers this season and ranks 19th in ERA since the All-Star break. Couple that with Houston's solid career stats against Woo, and I see upside in a wager on the total to be over seven runs on Friday.
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