PITTSBURGH (AP) — Pinch-hitter Josh Harrison singled home Francisco Cervelli with the go-ahead run in the eighth inning and the Pittsburgh bullpen continued its hot streak in the Pirates’ 5-3 victory over the Colorado Rockies on Friday night.

Gregory Polanco had three hits, drove in an insurance run and preserved a tie by throwing out Jose Reyes of the Rockies at the plate from right field to end the top of the eighth.

Tony Watson (3-1) earned the win with a scoreless inning of relief. Mark Melancon worked a perfect ninth for his major league-leading 42nd save. Pittsburgh relievers have won 18 straight decisions since last taking a loss on June 25.

The Pirates improved to 13-3 over their last 16 games to strengthen their grip on the top wild card spot in the National League.