Ervin, in right field in his fifth game, also had a single and double in four at-bats. On Wednesday, the 25-year-old homered as a pinch hitter for his first hit.
Joey Votto lofted a three-run homer in a nine-run, second-inning rally as Cincinnati raced to a 9-0 lead against Cubs starter Jon Lester on a warm day with the wind blowing out.
Ian Happ hit two solo shots and a sacrifice fly, and Alex Avila went deep and had three RBIs for the Cubs, who used six homers to erase a nine-run deficit for the first time since August 1989 versus Houston.
