Known as Leandro Calderon when he signed for $10,000 out of the Dominican Republic in 2021, Lopez spent two years in the Rookie-level Dominican Summer League before coming to the United States in 2023. After losing much of last season to shoulder fatigue, he returned in the Arizona Fall League. Improved conditioning and control and heavier reliance on his slider have helped him become one of the top starters in the system this year.
Though Lopez's low-80s curveball ranks as one of the best among Rangers farmhands, he has leaned more into his upper-80s slider with depth, which has turned into a plus pitch in 2025. His fastball sits at 93-95 mph and touches 97 but catches the heart of the plate too often. He lacks faith in a mid-80s changeup that tumbles at its best.
Getting in better shape has helped Lopez do a better job of repeating his delivery and providing consistent strikes for the first time as a pro. He works from a high arm slot that helps him stay on top of his pitches but produces less fastball life. If he can continue to refine his control, he can make it as a big league starter.
