PITTSBURGH — Baseball's home run focus is currently on Barry Bonds and Alex Rodriguez. A few more weeks, and it might shift to Ken Griffey Jr.

Griffey's 589th career homer was one of four by the Cincinnati Reds among their season-high 19 hits in a 13-4 win over the Pittsburgh Pirates on Friday night that halted a five-game losing streak.

Former Pirates farmhand Jeff Keppinger keyed a four-run first inning with a double and drove in three runs.

Scott Hatteberg and Griffey hit line-drive home runs into the right-field seats a batter apart in the seventh inning and Adam Dunn homered for the second game in a row to support Matt Belisle's first winning start in more than two months. Alex Gonzalez added a solo shot in the ninth.

Griffey's 26th of the season probably couldn't have left PNC Park any quicker. Reliever Jonah Bayliss left a pitch up and in to Griffey, and his drive reached the top of the seats in barely a moment. With the Reds having 52 more games to play, Griffey could get close to No. 600 by season's end.

"I got a ball up I could hit and I was able to hit it, but once it left the bat I couldn't control it," said Griffey. "I try to get them up and, hopefully, they go out."

Plenty of them went out as the Reds halted a five-game losing streak in which they were outscored 35-9.

"We've been struggling, I've been struggling — my timing was a little off," Griffey said. "Today was just one of those days. You can't explain it."

Belisle (6-8) has struggled, too, except against Pittsburgh. Half of his victories are against the Pirates as he beat them for the third time in as many starts by allowing three runs over six innings. It wasn't exactly a standout start — he gave up nine hits, including Ryan Doumit's two-run homer — but Belisle managed to win for the first time in 11 starts since beating Houston on May 29.

"It seems like it's been a while, it has been a little bit," Belisle said. "It's great to get it after the skid we've been on."

The Pirates' Ian Snell (7-10), statistically one of the NL's best starters before the All-Star break but one of its worst after it, was hurt again by a poor first inning in losing his fifth in a row. The right-hander gave up 10 hits and six runs in five innings, the fourth time in those five starts he has allowed four or more runs.

"I really don't have anything to say," Snell said. "It's disgraceful, the way I've pitched the second half. I have no one to blame but myself. The first half was so great, I don't know how to explain it. I'm just bad right now."