Yahoo Sports reports: Owen Caissie had a two-run double to cap a four-run seventh inning and the Miami Marlins beat the Pittsburgh Pirates 8-3 on Friday night for their sixth straight victory. Tied at 2 going into the seventh, the Marlins scored four runs off reliever Wilber Dotel (1-2). Xavier Edwards brought home the go-ahead run with a sacrifice fly, Heriberto Hernandez had an RBI single and Caissie broke it open with his double off the fence in center.