Cincinnati Reds' Scooter Gennett broke out of his slump in a major way by hitting four home runs -- including a grand slam -- on Tuesday against the St. Louis Cardinals.

He became the first player in Reds history to hit four home runs in a game and just the 17th in the history of Major League Baseball in Tuesday’s 13-1 victory over the Cardinals.

Scooter’s big night: Gennett’s night started modestly with an RBI single in the first inning, before getting much, much more interesting later on.

Gennett hit his second career grand slam in the third inning to give the Reds’ a 5-0 lead.

An inning later, he came up with two on and the Reds’ up 8-0 and hit a two-run home run.

Then in the sixth, Gennett hit a solo home run, giving him three homers and eight RBI.

Gennett was due up fourth in the eighth inning, so he needed at least one runner to get on base for him to have a shot against Cardinals reliever John Brebbia to become the first Reds player to ever hit four home runs in a game.

Scott Schebler, who entered teh game in the seventh, walked with one out and Gennett got his chance after Eugenio Suarez struck out.

Gennett watched strike one before taking a huge cut at strike two. Brebbia tried to throw a fastball by Gennett for a strikeout, but couldn’t. Gennett lined it 377 feet into the stands in right for his fourth home run of the game.