CINCINNATI (AP) - Mike Moustakas hit a big three-run homer in the fifth inning, and the Cincinnati Reds beat the Pittsburgh Pirates 9-4 on Monday night for a doubleheader sweep.

Moustakas drove in Shogo Akiyama and Eugenio Suárez with a two-out shot to center off Nik Turley (0-2). Pittsburgh had just taken a 4-3 lead on rookie Ke'Bryan Hayes' two-run shot with two out in the top half of the inning.

Brian Goodwin and Joey Votto also connected for Cincinnati, which won a third straight game for the first time since Aug. 28. Sal Romano (1-0) got the victory, retiring Gregory Polanco with the bases loaded for the final out of the fifth.

In the opener, rookie Tyler Stephenson hit a tiebreaking two-run homer in the seventh inning, lifting the Reds to a 3-1 win.

With two out and the bases empty, rookie Jose Garcia singled to left against Sam Howard (2-2). Manager David Bell then sent Stephenson up to hit for Shogo Akiyama, and the catcher hit a drive to left for his second homer.

The 24-year-old Stephenson lifted his batting helmet off his head with his left hand and pumped both arms in the sir before being swarmed by teammates at the plate.

Votto also homered in the first game, and Raisel Iglesias (3-3) got two outs for the win.

Colin Moran connected for Pittsburgh in the opener, and Josh Bell went deep in the second game.

The Reds broke open the second game by scoring three runs in the sixth without getting a hit. Akiyama walked with the bases loaded. Shortstop Erik Gonzalez had a costly error, and Curt Casali scored on a wild pitch by Geoff Hartlieb.

Anthony DeSclafani struck out seven in 4 2/3 innings for Cincinnati in his first start since Sept. 5. He was charged with four runs and seven hits.

Pittsburgh right-hander Mitch Keller permitted three runs in three innings. He was activated off the injured list after being sidelined by a left oblique injury.

Keller walked Suárez leading off the second. Moustakas flied out before Goodwin lofted an opposite-field drive into the left-field seats.

Goodwin's homer was his second in two days and sixth of the season.

Votto led off the third with a booming shot to deep right-center for his ninth homer.