Dan Uggla led off with a single up the middle off Arquimedes Caminero (0-1), and Gattis followed with a shot into the left-field seats for his fifth homer of the season - and first career walkoff homer.
Andrelton Simmons homered for the Braves, and Jason Heyward put Atlanta 2-1 with a seventh-inning single off Mike Dunn. Anthony Varvaro (1-0) worked a scoreless inning for the win.
Julio Teheran turned in another stellar outing by Atlanta's rotation, allowing only one run and five hits over seven innings. He actually lowered Atlanta's starting ERA, already the best in the majors, from 1.54 to 1.52.
Garrett Jones homered leading off the second for Miami. The Marlins tied it in the ninth with Derek Dietrich's run-scoring double off Craig Kimbrel.
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