After signing for $45,000 out of the Dominican Republic in 2023, Valera posted a 5.93 ERA in the Rookie-level Dominican Summer League in his pro debut. He was much more impressive after coming to the United States in 2024, logging a 1.99 ERA, .125 average-against and 68 strikeouts in 63 1/3 innings between Rookie ball and Single-A. The Red Sox parted with three teenage right-handers (Gilberto Batista, Ovis Portes, Yeferson Vargas) at the Trade Deadline but held onto Valera.
At age 18, Valera worked at 93-96 mph and topped out at 99 with good carry on his four-seam fastball, which could add more velocity as he continues to strengthen his 6-foot-3 frame. He gets nice shape on his 82-85 mph slider, which features both horizontal and vertical action, and he also has a tighter cutter in the upper 80s. His upper-80s changeup lags well behind his other offerings, as it's too firm and lacks life.
Valera employs a simple side-step delivery and high three-quarters arm slot, and he'll vary his tempo to disturb hitters' timing. He'll need to polish his strike-throwing and refine his changeup, but the upside of a mid-rotation starter is there. Club officials praise his work ethic and his aptitude for taking instruction and turning it into results.
