Ian Seymour

Seymour's outs market tells the story: Under 15.5 outs is priced at -179 (64.1%), meaning the market strongly expects him out before completing 5.2 innings. Short outing cap limits Ks regardless of his underlying 29.0% K rate. Last 3 starts: 5 K in 5.0 IP, 10 K in 6.0 IP, 2 K in 3.0 IP — a violent range with two of three at or under 5 Ks. His vs-NYY line is similarly volatile: 12, 2, 3 Ks in three starts. Two of last three NYY matchups he finished with 2-3 Ks. Playoff-pressure-free Yankees lineup at 5-5 last 10 may be passive, but the outing-length risk is the decisive factor here.

Seymour is running 11.04 K/9 in 2026 (150 K in 122.1 IP). Last three starts: 10 K, 2 K (shortened to 3.0 IP), 10 K — the outlier outing was a short-outing blowup, not a command issue. BOS batters have been completely neutralized: Rutschman 0-for-4, Duran 0-for-4, Contreras 0-for-4, Kiner-Falefa 0-for-4 vs Seymour career — the matchup history shows zero lift from Red Sox starters. At 15.5 outs line (~5.2 IP projected), 11.04 K/9 projects to 6.4 Ks in that workload, clearing 5.5 comfortably. Tropicana Field dome suppresses park noise — consistent velocity environment. TB on 6-game win streak means no urgency to pull early.

Seymour's 2026 K/9 extrapolates to approximately 10.85 across 116.1 IP (140 K). HOU is 16-21 vs LHP this season — they struggle against left-handed starters. Yordan Alvarez is day-to-day with a right ankle injury after missing Sep 11; if he's out, the Astros' most dangerous bat is gone and the lineup weakens materially vs a southpaw. Seymour's Aug 31 start produced 10K in 6.1 IP. The Sep 6 short outing (3 IP) is a risk, but 6-day rest and a depleted HOU lineup tilt toward the over. Line of 5.5 is achievable in 5+ innings.