PITTSBURGH — Jeremy Hellickson was under the weather, though still good enough to end his road woes.

Hellickson won on the road for the first time in 2 ½ months and Jake Lamb homered to lead the Arizona Diamondbacks to a 4-1 victory over the Pittsburgh Pirates on Monday night.

Hellickson (9-8) allowed one run and three hits in 5 1-3 innings while striking out four and walking one. He had gone 0-4 with an 8.67 ERA in his previous six road starts since winning May 30 at Milwaukee.

Diamondbacks manager Chip Hale lifted Hellickson with two on and one out in the sixth inning when the right-hander’s gluteus muscle began tightening because of dehydration.

“It shows what type of pitcher he is, especially here as hot and humid as it is,” said Diamondbacks reliever Addison Reed, who escaped a bases-loaded jam in the seventh inning to protect the 4-1 lead.

“It’s tough enough to pitch in a place like San Diego, where the weather is perfect. When it’s hot, you’re losing a lot of fluids and a guy isn’t feeling good . it’s a great job by him.”

Lamb connected for his fifth home run in the fourth inning, a solo shot off Gerrit Cole (14-7) that put the Diamondbacks ahead 4-0 and helped snapped the National League wild card-leading Pirates’ four-game winning streak.

David Peralta had two hits for the Diamondbacks, including an RBI double in a two-run first inning. He is hitting .462 (30 for 65) with 21 RBIs in his last 19 games.

Pedro Alvarez hit his 19th homer of the season for rhe Pirates’ only run.

Cole gave up four runs and nine hits in 6 2-3 innings with one walk and five strikeouts. He entered August leading the majors in wins but is 0-3 with a 4.70 ERA in four starts during the month.

“That’s a good offensive club,” Pirates manager Clint Hurdle said. “We made some mistakes over the plate. “