PITTSBURGH — Adam Frazier and Ke'Bryan Hayes led off the bottom of the first inning with back-to-back homers off Kyle Hendricks, giving the Pittsburgh Pirates all the offense they'd need to slip by the playoff-bound Chicago Cubs 2-1 on Wednesday night.

The Cubs clinched their fifth postseason spot in six years on Tuesday night and maintain a fairly healthy lead in the NL Central with four days left in the regular season.

Still, the offense remains a bit of an issue for the Cubs. They've scored nine runs total while dropping four of their last five games.

Frazier turned on the fourth pitch he saw from Hendricks (6-5) and sent it to the railing atop the seats in right field and Hayes continued his impressive rookie season when he followed with his fourth of the season, a lined shot to right-center field.

Trevor Williams (2-8) ended a nightmarish season on a high note, settling down after Anthony Rizzo's 11th home run in the top of the first to record just his second win in 15 starts dating back to last season.