PHOENIX — Jon Jay got his first three hits for Arizona, including a three-run homer, and the Diamondbacks won their fifth game in a row with a sloppy 13-8 victory over the Pittsburgh Pirates on Tuesday night.

Nine of the runs were unearned.

Jay, acquired Thursday in a trade with Kansas City, was hitless in 12 at-bats for the Diamondbacks before his leadoff single in Arizona’s six-run first inning. His opposite-field homer in the eighth broke the game open after the Pirates had rallied from an 8-0 deficit to trail 10-8.

Starling Marte hit a three-run homer, doubled and made a diving grab in center field for the Pirates.

Fernando Salas (4-4) gave up a run in 1 1/3 innings and got the win.

The Diamondbacks, awful on offense throughout May, have scored 51 runs in the last five games. They’ve won 11 of 14 and lead the NL West by three games over the surging Los Angeles Dodgers.

The Pirates have lost six of eight and fell to 1-4 on a six-game trip that ends Wednesday afternoon with the series finale in the desert.

Arizona jumped on Trevor Williams (5-4) in the first with six runs, two on Ketel Marte’s seventh triple of the season. Five runs were unearned thanks to three Pirates errors, two on one play.