RHP
George Kirby
Seattle Mariners
ERA4.06
WHIP1.34
BAA.283
IP148.2
SO127
BB34
Pregame preview
Monday, August 31, 2026 · 06:45 PM ET
Seattle MarinersProjected runs4.13
Projected Winner
Boston Red Sox+0.14 BOS
Boston Red Sox+0.14 BOSBoston Red SoxProjected runs4.27
Fenway Park
Seattle Mariners
Team stats · entering today
OPISeattle Mariners offense. Offensive Potency Index — rolling batting Impact per plate appearance before today.—
SISeattle Mariners pitching staff. Suppression Index — rolling opponent batting Impact allowed. Lower is better.—
RPGRolling runs scored per game before today.3.43
RA/GRolling runs allowed per game before today. Lower is better.5.77
Pen qualityRolling bullpen Impact rate — how effectively relievers limit damage per batter faced.—
FormRecent RPG vs season RPG — positive means the offense is running hotter than its baseline.-0.44
Lineup OPSAverage OPS for the projected top nine vs L (LHP), minimum 20 PA in that split.—
Top-3 OPSAverage OPS vs LHP for batters projected 1–3 in the order.—
Probable starter
Boston Red Sox
Team stats · entering today
OPIBoston Red Sox offense. Offensive Potency Index — rolling batting Impact per plate appearance before today.—
SIBoston Red Sox pitching staff. Suppression Index — rolling opponent batting Impact allowed. Lower is better.—
RPGRolling runs scored per game before today.4.57
RA/GRolling runs allowed per game before today. Lower is better.4.36
Pen qualityRolling bullpen Impact rate — how effectively relievers limit damage per batter faced.—
FormRecent RPG vs season RPG — positive means the offense is running hotter than its baseline.0.19
Lineup OPSAverage OPS for the projected top nine vs R (RHP), minimum 20 PA in that split.—
Top-3 OPSAverage OPS vs RHP for batters projected 1–3 in the order.—
Probable starter
LHP
Payton Tolle
Boston Red Sox
ERA3.13
WHIP1.10
BAA.221
IP126.1
SO142
BB35
Model factor edges
Platoon RPGLineup vs starter handEvenLineup vs starter hand
Lineup strengthTop-9 OPS vs opp handEvenTop-9 OPS vs opp hand
Statcast starterxwOBA / whiff EWMEvenxwOBA / whiff EWM
Bullpen fatigue3-day pen IP edgeEven3-day pen IP edge
Pen qualityImpact rate EWMEvenImpact rate EWM
Park factorFenway ParkEvenFenway Park
WeatherWeather unavailableEvenWeather unavailable
UmpireUmpire unavailableEvenUmpire unavailable
Lineups
OPS splits vs opposing starter · Seattle Mariners vs Payton Tolle (LHP) · Boston Red Sox vs George Kirby (RHP)
Seattle Mariners
| Player | PA | OPSSeason OPS vs opposing starter hand. | |
|---|---|---|---|
| 1 | Josh Naylor | — | — |
| 2 | Cole Young | — | — |
| 3 | J.P. Crawford | — | — |
| 4 | Randy Arozarena | — | — |
| 5 | Dominic Canzone | — | — |
| 6 | Cal Raleigh | — | — |
| 7 | Colt Emerson | — | — |
| 8 | Victor Robles | — | — |
| 9 | Luke Raley | — | — |
Boston Red Sox
| Player | PA | OPSSeason OPS vs opposing starter hand. | |
|---|---|---|---|
| 1 | Anthony Seigler | — | — |
| 2 | Ceddanne Rafaela | — | — |
| 3 | Wilyer Abreu | — | — |
| 4 | Andruw Monasterio | — | — |
| 5 | Caleb Durbin | — | — |
| 6 | Carlos Narváez | — | — |
| 7 | Jarren Duran | — | — |
| 8 | Masataka Yoshida | — | — |
| 9 | Romy Gonzalez | — | — |