Atlanta went ahead, 4-3, in the 10th inning when with runners on first and second and two outs, Jace Peterson singled to left field off Trevor Gott, scoring Nick Markakis.
After Danny Espinosa and Chris Heisey singled with Jim Johnson on the mound in the bottom half of the frame, Anthony Rendon reached on an infield single, scoring Espinosa.
Strasburg started the game and retired six of the eight hitters he faced, but the right-hander left in the third inning after striking out Mike Foltynewicz.