Bello threw 38 sinkers, averaging 95.1 mph and topping out at 97.3 mph, per Statcast. He also mixed in 36 sliders, 17 changeups and six four-seam fastballs. He recorded seven swings and misses: four with his slider, two with his changeup and one with his sinker.

Catcher Carlos Narváez helped Bello along in his first start of 2025 for the Red Sox. Bello lasted five innings and allowed one run on four hits and three walks while striking out three.