Astros vs. Mariners prediction, odds, time: 2026 MLB picks for 'Sunday Night Baseball' by proven model
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- Bryan Woo (8-8, 4.15 ERA) starts for Seattle against Houston's Hunter Brown (3-2, 3.68 ERA) at Daikin Park, with first pitch set for 7:20 p.m. ET on Sunday Night Baseball.
- The Mariners (58-66) took Saturday's contest 10-5 with 15 hits after the Astros (63-61) won Friday's series opener, putting Seattle at 8-1 against Houston in their last 10 matchups.
- The SportsLine model picked the Over on 8 total runs after simulating the game 10,000 times, projecting 8.6 combined runs with the Over hitting in 57.7% of simulations.
- The Over has cashed in 7 of 10 meetings between these clubs this season, including each of the first two games of this series and three straight head-to-head matchups overall.
- Both starting pitchers' splits favor the Over — Woo carries a 6.22 road ERA compared to 1.96 at home, while Brown's home ERA sits at 4.17 versus 3.00 on the road.
- Houston has hit the Over at the third-highest rate in the American League in 2026, with Seattle ranking fifth, and eight of the Astros' last nine games versus fellow AL teams have surpassed the total.
- The model enters Week 21 of the MLB season on a 45-30 run across top-rated picks, with Houston listed as a -121 moneyline favorite and the over/under sitting at 8.
Why it matters: The model is putting its 45-30 Week 21 run behind an Over pick with a 57.7% simulated hit rate for an Astros-Mariners game where the Over has already cashed in 7 of 10 meetings this season. With both starters showing splits that favor high-scoring games (Woo's 6.22 road ERA, Brown's 4.17 home ERA), the model's 8.6-run projection clears the 8-run total with what it considers a comfortable margin.
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