Kyle Harrison's call-up becomes a live fantasy storyline as the Red Sox weigh a lingering left ankle injury with MRI in play. In the minors he went 5-2 with a 3.58 ERA, 86 Ks in 75 innings, and a scorching August ERA of 2.25, making him a potential rotation upgrade if cleared. Boston’s bullpen and manager updates add nuance for late-season planning, while veteran arms like Aroldis Chapman shape relief usage. Monitor Harrison’s availability as rosters shift.