ATLANTA — Nick Markakis had three hits, including a tie-breaking two-run double in the seventh inning, and the Atlanta Braves beat the struggling Miami Marlins 6-3 on Friday night. Markakis extended his hitting streak to 14 games, finishing 3 for 4 with a run scored and two RBIs as the Braves erased a 3-2 deficit in the seventh to win for the fourth time in six games. Ross Detwiler (1-5) earned the win by getting one out after coming in for starter Julio Teheran with two outs in the seventh.