Andrew McCutchen had to wait a little longer to resume his assault on opposing pitching. A monsoon encircled PNC Park, delaying the game Wednesday night for 1 hour, 38 minutes. Lighting flashed in every direction; the PNC Park audio crew obliged, blaring Pearl Jam's "Lightning Bolt."

McCutchen provided his brand of thunder in the Pirates' 4-2 win against the Chicago Cubs. He homered for the third consecutive game and extended his hitting streak to seven games. He has 13 extra-base hits, six of them homers, in 10 games this month, and he has four consecutive multi-hit games.

"It's just so fun to watch a guy up there with that kind of confidence night in, night out," manager Clint Hurdle said. "Once this calendar month flipped, man, he's hit another gear."

Cubs starter Jason Hammel walked Josh Harrison on four pitches in the first. Two batters later, McCutchen hit a 1-0 fastball high in the air down the left-field line. The ball deflected off the outstretched glove of Chris Coghlan, who jumped and reached over the wall, for McCutchen's 10th homer this season.

"Yeah, I definitely would have went out there and high-fived him if he would have caught that," McCutchen said.

McCutchen is hitting .318 with a .542 slugging percentage.

"When he gets a pitch to hit, he's not missing it," Hurdle said. "The balls are going line to line. He's in command of the at-bat and the pitches that aren't there, he's taking."

Brandon Cumpton completed five innings and allowed two runs in his second solid start in a row after an 11-run, 32/3-inning disaster in Los Angeles.

Cumpton allowed baserunners in every inning except the fourth, but bailed out his infielders in his fifth and final inning. Justin Ruggiano reached second with one out when Pedro Alvarez threw the ball into the seats. Cumpton walked Anthony Rizzo but got Starling Castro to line out.