MLB Preview · August 21, 2026
San Francisco Giants at Boston Red Sox: Prediction, Odds & Preview
SF 42-55at BOS 48-48·Fenway Park·
DiamondIQ Model — Win Probability
SF44%56%BOS
The model leans BOS (56%). DiamondIQ model v2: season records, home-field advantage, the starting-pitcher quality gap (PitchIQ), and a calibration adjustment fit and validated on four seasons of backtest — plus live game state once underway.
Forecast at First Pitch
☀️77°FClear
Wind 13 mph S · R→L
Precip 0%
Injured List
SF
Harrison Bader (CF)Injured 10-Day
Jonah Cox (CF)Injured 10-Day
Matt Chapman (3B)Injured 10-Day
Victor Bericoto (RF)Injured 10-Day
Matt Gage (P)Injured 15-Day
Hayden Birdsong (P)Injured 60-Day
BOS
Isiah Kiner-Falefa (2B)Injured 10-Day
Marcelo Mayer (2B)Injured 10-Day
Connelly Early (P)Injured 15-Day
Ranger Suarez (P)Injured 15-Day
Garrett Crochet (P)Injured 60-Day
Johan Oviedo (P)Injured 60-Day
Follow it live in the Game Center
Live win probability, pitch-by-pitch, and the model updating in real time.