The Nationals previously trailed the Marlins 9-0 in the fourth inning. In the sixth, Turner's grand slam put the Nats up 10-9.
Trea Turner knows how to come up clutch.
He fueled the Nationals' nine-run comeback against the Marlins with eight RBIs, including a go-ahead grand slam that pushed Washington ahead, 10-9. Miami sent the go-ahead run to the plate in the ninth but the Nats hung on to end a five-game losing streak.
After trailing the Marlins 9-0 in the fourth inning, the Nationals rallied for six unanswered runs before Turner came up with the bases loaded in the sixth.
Turner yanked a grand slam just over the leftfield wall as Nationals Park erupted.
After Turner returned to the dugout, he popped back out for a curtain call, lifting his helmet into the air to acknowledge the crowd.
In all, the Nationals scored 14 unanswered runs after trailing 9-0.
The last team that won a game after trailing by nine or more runs was the Mariners, who beat the Padres 16-13 in 2016, according to ESPN Stats and Info.