The teams split a four-game series.
Ross went 3-for-5 with two doubles and Dan Uggla was 3-for-4 as part of a 15-hit Florida attack.
Cameron Maybin hit a solo homer in the fourth to give the Marlins a 4-1 lead and they then broke the game open with a big fourth inning.
Jorge Cantu doubled home the first run of the inning and then Ross drove in two more with a two-base hit. Ross eventually scored on a single by John Baker. Cantu set a major league record at the start of the season by having an RBI and a run scored in each of his team's first 10 games.
Ross added an RBI double in the sixth.
Josh Johnson (1-1) took advantage of the offensive show to get the win, allowing a run on five hits and striking out 10 over six innings. Aaron Harang (0-2) surrendered eight runs on 10 hits in four-plus innings.