CHICAGO — Gregory Polanco homered twice to help back a third straight solid start by Trevor Williams, and the Pittsburgh Pirates pulled away from the Chicago Cubs 6-1 on Thursday.
Francisco Cervelli lined a three-run shot in the seventh off Cubs reliever Justin Wilson as Pittsburgh scored four times in the inning to break open a tight game. Adam Frazier also went deep for Pittsburgh, which improved to 9-3.
Kyle Schwarber homered, doubled and singled for three of the Cubs' seven hits. Chicago's Ian Happ had his first two-hit game this season.
Williams (3-0) was a touch better than Chicago starter Kyle Hendricks (0-1) in what began as a pitchers' duel following Chicago's 13-5 rout of Pittsburgh on Wednesday night.
The Pirates' right-hander allowed one run and four hits through six innings, while striking out five and walking one.
Hendricks allowed two runs and five hits and struck out seven through six innings as he rebounded after allowing four runs in five innings in a no-decision at Milwaukee last Friday.
Pittsburgh's Michael Feliz, George Kontos and Felipe Vazquez each pitched a scoreless inning in relief.
Javier Baez went 0-for-4 after homering twice on both Tuesday and Wednesday. Chicago's high-energy infielder became the first Cub with consecutive multi-homer games since Alfonso Soriano in May 2008.
Polanco's third career multi-homer game lifted his season total to a team-leading five.
Polanco hit his fourth homer into the bleachers in right-center in the first to give Pittsburgh a 1-0 lead.
Schwarber led off the bottom of the fourth with a drive that landed halfway up the right-field bleachers and tied it at 1. He hit his third home run on a full count and into a steady, chilly wind off Lake Michigan.
Frazier put the Pirates back in front 2-1 in the fifth with a solo shot into the first row of the left-center bleachers. It was the first homer for the Pirates' leadoff hitter.
Polanco's second homer of the game, a shot to left-center off Wilson with one out in the seventh made it 3-1. After Wilson walked Josh Bell and Corey Dickerson, Cervelli smacked his second homer this season.
Pirates: OF Bryan Reynolds, a 23-year-old highly touted prospect at Double-A Altoona, will undergo surgery on Friday to repair a fractured hamate bone in his left wrist. Reynolds was acquired from San Francisco in January in a trade that sent Andrew McCutchen to the Giants.
Cubs: Despite playing while being under the weather, OF Albert Almora Jr. had three hits and scored two runs as the leadoff hitter in Chicago's 13-5 rout of Pittsburgh on Wednesday. Manager Joe Maddon held Almora out of the lineup on Thursday not because of illness, but because of matchups and dispersing playing time among his outfielders. "This is predetermined," Maddon said, while noting Almora "looked like Gumby" on Wednesday.
Pirates: RHP Chad Kuhl (1-0, 5.06 ERA) faces Marlins LHP Dillon Peters (1-1 9.35) in the opener of a three-game series in Miami.
Cubs: RHP Yu Darvish (0-0, 5.23) makes his first home start as a Cub and third of the season in a Friday afternoon opener of a three-game set against Atlanta. After being roughed up for five runs in 4 1/3 innings in his Cubs debut at Miami on March 31, Darvish allowed just one run and struck out nine in six innings at Milwaukee last Saturday. The Braves counter with Anibal Sanchez (0-0, 2.25).