PITTSBURGH — Jose Castillo was on his way to the clubhouse, celebrating not only a game-winning home run but a streak of six consecutive games with a homer when a Pirates teammate grabbed him and pushed him back toward the field.

No home run. No six-game streak. And, at least for a couple of minutes, no Pirates victory, though it took only one more batter to clear up the confusion.

Ryan Doumit hit a game-winning single after the umpires took away Castillo's apparent homer and called both teams back onto the field, and the Pirates finished off a four-game sweep of the Milwaukee Brewers with a bizarre 4-3 victory Thursday.

The Pirates trailed 3-2 entering the ninth, but Jeromy Burnitz doubled off Brewers closer Derrick Turnbow (2-2). One batter later, Castillo hit a long drive that bounced off the padding atop the right field wall and was first called a home run.

"It was fun celebrating," Burnitz said. "But once I saw their guys emphatically running in, I knew there was a chance we might have to replay it."

After conferring behind second base, the umpires decided Castillo's drive did not clear the wall and put him back at second — after some Pirates had headed to the clubhouse and fireworks were shot off. Brewers manager Ned Yost argued Castillo stopped at first and should have been put there, though Castillo was seen running the bases and touching home following the initial wave of confusion.

"My argument was why did he get second base?" Yost said. "Nobody saw him stop at first."

Castillo felt the ball had left the park and was confused why he had to go back.

"I don't know why the umpires said no," he said. "I was mad — but for the Pirates. I'm happy for the team winning every day."

Doumit then worked the count to 3-1 before grounding a ball down the right-field line, scoring Castillo easily and allowing the Pirates to celebrate a second time.

"I'm banging Castillo on his head and celebrating and the next thing I know, they're doing it to me," Doumit said.

Castillo drove in three runs, adding two sacrifice flies, and closed out a remarkable series with one of the Pirates' best defensive plays all season with a sliding catch in right field of Chad Moeller's popup in the fourth. Castillo went 9-of-13 with four home runs, two doubles and 14 RBI in the series.

"It was one of the most impressive series I've seen out of one guy," Brewers starter Dave Bush said.

John Grabow (1-1) got the final out of the ninth for the victory as the Pirates swept a series of three games or longer for the first time since taking three from the Reds in July 2004. The Brewers have lost five in a row.

The Pirates, trying to play catchup after losing 33 of their first 47, outscored Milwaukee 36-8 while sweeping the series.

"Yes, it's possible," Burnitz said of the Pirates' attempt to turn their season around by winning six of seven so far during a 10-game homestand. "Yes, that would definitely be the hope. It's a definite confidence builder."