, Williams gave up four straight hits. Gonzalez followed Grudzielanek with an RBI double before
's two-run single made it 5-1.
capped the uprising with a sacrifice fly.
"Hopefully, this will be my (bad) one for this year," Williams said. "It stinks when it happens. You want to come in and shut guys down. When you don't get it done, it's frustrating, especially after the strong way we came back into the game."
Coming off his first loss, Prior allowed one run and six hits in nine innings with two walks and six strikeouts.
"We tried to wear guys down," Prior said. "Dusty's philosophy is to pick it up early in the game, be aggressive and get their pitch count up."
"Mark pitched a tremendous game, and to get that win in the last inning, I'm sure's he's excited," Gonzalez added. "Mark makes the game go along rather quickly. It's a pleasure to play behind him."
The Cubs managed just two hits off Pirates starter
, but took a 1-0 lead in the fourth as
was hit by a pitch with two outs and scored on rookie
Hee Seop Choi
"My job is to go out and just put up zeros," Wells said. "If we score, that's great. If we don't, it just means there are more zeros I have to put up. I think a starter has to go out and make his own luck. I'll just continue to pitch the way that I have. Sometime our offense is going to produce for me."
"It's a tough loss," Pirates manager
admitted. "Wells, I thought, pitched a better game than Prior. He only made one pitch to Choi that was hit hard in seven innings."
pitched a perfect 10th for Chicago, which has won five in a row for the first time since May 21-25 of last season.