№ 01Griffin Jax carries a 5.30 xERA over 75.0 innings, flagging his 4.08 ERA as run prevention living on borrowed time.
№ 02The gap between Jax's 4.08 ERA and 5.30 xERA runs 1.22, a regression signal that tends to catch up in a hitter-friendly park.
№ 03Jax's last five starts trend the wrong way: a 2.45 ERA in the earlier outings has ballooned to 7.20 in the most recent ones.
№ 04The home offense is heating up, averaging 4.3 runs per game over the last 7 days at a Fenway Park playing to a 1.10 run environment.
№ 05Jake Bennett's 2.93 xERA and 2.91 FIP over 53.7 innings is the honest counter, and Estabrook's 33.9% called-strike rate widens the zone.
§ 01The analysis
The number that anchors this over is Griffin Jax's 5.30 xERA across 75.0 innings. His 4.08 ERA looks fine on the surface, but the 1.22-run gap between the two says the run prevention has been outrunning the process, and the recent trend backs that up: a 2.45 ERA in his earlier outings over the last five starts has given way to a 7.20 ERA in the most recent ones. He is striking out 24.9% of batters, but the 4.34 FIP tells the same story as the xERA. He walks into Fenway Park, which carries a 1.10 run environment this season, against a home lineup averaging 4.3 runs per game over the last 7 days. The counter is real. Jake Bennett owns a 2.93 xERA and a 2.91 FIP over 53.7 innings with swinging-strike and K stuff trending up, and home-plate umpire Mike Estabrook has called strikes on 33.9% of taken pitches, a wider zone than league average. Both lineups have also been cooling off in their platoon splits, the home side over 587 plate appearances against righties, the away side over 164 against lefties.
§ 02The call
The read leans on Jax. A 5.30 xERA, a 4.34 FIP and a five-start ERA that has jumped from 2.45 to 7.20 all point at a starter due to give runs back, and Fenway's 1.10 run environment plus a home offense scoring 4.3 per game over the last week is the spot for it to happen. Bennett's 2.93 xERA and Estabrook's 33.9% called-strike zone are the honest risk on the under side, but at -102 the price on over 9 lines up with the pitching profile that matters most.
Final resultWINOver 9 -102 · -102 Graded Jul 17, 2026