Though he pitched just 91 1/3 innings while logging a 5.32 ERA in three seasons at Southern California, Flores showed enough to get the White Sox to take him in the seventh round of the 2016 Draft. His stuff backed up in his first full season as a pro and never has rebounded fully, but learning how to survive with less velocity made him a better pitcher. He successfully navigated in Double-A despite losing two months to an oblique injury and claimed a spot on Chicago's 40-man roster in November.
Flores' fastball once reached 97 mph but now sits at 90-93 mph and tops out at 95 but avoids barrels with its riding life. Though the consensus is that his changeup is his best offering and shows flashes of becoming a plus pitch, right-handers hit him hard in 2019. He has improved his curveball and added a slider/cutter in 2018.
Flores manages to succeed with four average offerings because he has greatly improved his control and command since college. He's the best strike-thrower in the system and generates a lot of ground-ball contact. He also fields his position well and has a deadly pickoff move, adding to his profile as a back-of-the-rotation starter.