Gattis went 2-for-4 with two home runs, four RBI and three runs scored during Sunday's 7-6 win over Seattle. Gattis hit a three-run shot in the first inning off Mariners' starter J.A. Happ before hitting a go-ahead solo home run in the eighth inning off reliever Carson Smith. He now has six home runs this season after going hitless in his first 23 at-bats of 2015.