Nick Gonzales hit a walk-off RBI single in the 10th inning after Pittsburgh tied the score with four runs in the ninth, lifting the Pirates to a 7-6 victory over the visiting San Francisco Giants on Tuesday.

Gonzales singled up the middle on the first pitch of the inning from Erik Miller (0-2), scoring automatic runner Michael A. Taylor from second base.

Thairo Estrada and Matt Chapman each hit home runs for San Francisco, which saw a four-game winning streak come to an end. The Giants led 6-2 before Pittsburgh forced extra innings with their late four-run rally.

With one out and the bases loaded in the ninth, the Pirates' Ji Hwan Bae singled in a run against Camilo Doval. Andrew McCutchen followed with a ground ball that was mishandled by shortstop Marco Luciano, allowing Yasmani Grandal to score from third base.

The Pirates pulled within 6-5 when Jared Triolo scored on Bryan Reynolds' groundout, and then tied the score on Oneil Cruz's RBI double to right field.

David Bednar (3-3) pitched a scoreless 10th inning for Pittsburgh, which improved to 5-1 in extra-inning games. Cruz had three hits, while Gonzales and McCutchen had two apiece.

San Francisco took the lead in the first inning against Martin Perez. With runners on the corners and two outs, Wilmer Flores hit a pop fly to shallow left field that was dropped by Cruz, allowing two runs to score.

Cruz called off left fielder Jack Suwinski on the fly ball, which hit off Cruz's glove for his ninth error of the season.

Pittsburgh responded in the second inning when Gonzales hit a leadoff single, advanced to third on Suwinski's single, and scored on Triolo's sacrifice fly.

Estrada put the Giants ahead 4-1 with a two-run homer in the fifth inning against Perez, who allowed four runs (two earned) on five hits over 4 1/3 innings. He walked three and struck out four.

Pittsburgh pushed a run across in the fifth inning when Bae scored on a Reynolds' fielder's choice grounder.

Giants starter Logan Webb pitched six innings, allowing two runs on six hits with one walk and six strikeouts.

Chapman hit a solo homer against Luis Ortiz with one out in the seventh inning to put the Giants ahead 5-2.

San Francisco extended its lead to 6-2 in the eighth inning against Kyle Nicolas. Luciano hit a leadoff single, Curt Casali walked, and both runners advanced on a wild pitch before Luciano scored on Estrada's groundout.