Zac Gallen pitched seven innings of two-hit ball for his first major league win and Cesar Puello hit a two-run homer in the eighth inning as Miami won its second straight game, beating the Chicago White Sox 2-0 on Wednesday night.

Puello launched his fourth homer deep to left on the first pitch from Reynaldo Lopez, making a winner out of Gallen (1-2) in his sixth start since joining the Marlins rotation on June 20.

The 23-year-old Gallen struck out nine, walked one and hit two batters in his longest outing to date as he lowered his ERA to 2.76. He threw 95 pitches and 68 strikes before being replaced by Nick Anderson in the eighth.

Sergio Romo worked around two singles in the ninth for his 17th save in 18 chances.

Lopez (5-9) allowed four hits and struck out 10 in eight innings, matching the longest outing of his career. The right-hander walked one and hit one batter in his third straight solid outing.

Lopez threw 76 of 97 pitches for strikes on Wednesday and retired 21 of 25 Miami batters through seven innings before hitting Harold Ramirez to lead off the eighth. After Jorge Alfaro struck out, Puello connected on a breaking pitch.

All-Star RHP Lucas Giolito (11-4, 3.12) takes the mound against Minnesota RHP Jose Berrios (8-5, 2.96) on Thursday in the opener of a four-game series. Giolito hasn't won since June 30 and is 0-2 with a no-decision in his last three starts. Berrios is 0-3 with four no-decisions in his last seven outings, despite a 2.62 ERA during the span.