ATLANTA — With the top players of the past on hand for Alumni Weekend, the current Atlanta Braves put on a performance worthy of their predecessors. Rookie Mike Foltynewicz won for the first time in three starts since returning to the rotation as Atlanta downed the slumping Miami Marlins 7-2 on Saturday night for their third straight win and fifth in seven games. “To come here and have the day we had today with all the legends here was great,” said Nick Swisher, who had a two-run double that broke the game open in the seventh in his first game as a Brave.