Mike Elko’s first big league hit was a homer. And a decisive one at that. Elko’s three-run shot in the bottom of the sixth inning put the Chicago White Sox ahead to stay. They went on to a 4-2 victory over the Miami Marlins. Elko hit .348 for Triple-A Charlotte this season, with 10 home runs in 31 games. The 26-year-old first baseman made his big league debut Saturday. He was the designated hitter Sunday when he connected to break a 1-all tie against Marlins ace Sandy Alcantara.