CHICAGO (AP) — Like many young pitchers, Reynaldo Lopez sometimes struggles with confidence.

Sunday was not one of those days for the 25-year-old right-hander.

Lopez struck out a career-high 14 and allowed two hits in six innings to lead the Chicago White Sox to a 4-1 victory over the Detroit Tigers for a sweep of their abbreviated two-game series.

“He knew he was commanding his fastball and he was aggressive with all his pitches,” catcher Welington Castillo said of Lopez. “It didn’t matter who was in the batter’s box.”

Lopez (2-3) allowed one unearned run and lowered his ERA to 6.03.

Jace Fry and Kelvin Herrera each worked a hitless inning, and Alex Colome got the final three outs for his fifth save.

The White Sox struck out 20 Detroit batters — Fry, Herrera and Colome had two each — to tie the major league record for a nine-inning game.

“It tells you they had great stuff,” Tigers manager Ron Gardenhire said.