CINCINNATI (AP) - A pitcher who hadn't allowed a home run all season gave one up in the eighth inning of a tied game. Now, there's a new way for the fading Cincinnati Reds to lose a game.

Carlos Gonzalez's two-run homer - Colorado's fourth overall - broke an eighth-inning tie and sent the Rockies to a 10-7 victory over the Reds on Monday night in a game that featured a long rain delay and seven homers in all.

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In a game of home run derby, the Reds came up one short.

``Add to frustration?' manager Dusty Baker responded to a question. ``The frustration's already here. We battled back, but the long balls got us tonight. We kept fighting back, but we couldn't keep it in the ballpark.'

Seth Smith hit two two-run homers for the Rockies, the fifth multihomer game of his career. Gonzalez snapped a 7-all tie with the first homer allowed this season by left-hander Bill Bray (2-2).

Todd Helton also homered for Colorado, which matched its season high with four. The seven combined homers accounted for 15 of the 17 runs.

Matt Belisle (6-4) pitched out of a threat in the seventh and Huston Street worked the ninth for his 29th save in 32 chances.

Jay Bruce, Drew Stubbs and Brandon Phillips homered for the Reds, who have lost five of seven.

Bruce got it started with a three-run homer in the first inning off Jason Hammel, his first since July 9.

Smith hit his homers off starter Homer Bailey, putting the Rockies up 5-3. Baker decided not to bring Bailey back following a 1-hour, 34-minute rain delay in the middle of the third inning - the first this season at Great American Ball Park.

``Of course it's frustrating,' said Bailey, who threw 62 pitches in only three innings. ``We're a much better team than the way we've been playing.'

Manager Jim Tracy chose to let Hammel return after the long delay, a move that quickly backfired. Bruce singled home a run, and Stubbs hit a two-run homer for a 6-5 lead.

The rain returned from time to time, though not heavy enough to stop the game again.

The homers kept coming, too.

Helton hit a two-run shot in the fifth for a 7-6 lead. The Reds tied it in the seventh on Phillips' second career pinch-hit homer. The second baseman was out of the lineup for the second straight day with a sore right ankle, but hit the first pitch from Rex Brothers into the upper deck in left field.

For a moment, it looked like the Reds had grabbed the momentum.

``I thought it gave us a little spark, until Gonzalez hit his homer,' Philips said.

Gonzalez's 16th homer put the Rockies ahead again. Mark Ellis doubled home a run in the ninth.

Notes: Colorado's Troy Tulowitzki had his fifth straight multihit game. ... Smith has excelled in Ohio this year. He had two homers on June 21 in Cleveland. ... The Reds had 1B Yonder Alonso take grounders at 3B before the game and plan to use him there at some point. ... Colorado RHP Esmil Rogers makes his first career start against the Reds on Tuesday. He made two relief appearances against Cincinnati last season, giving up a run in three innings. ... Rogers is coming off his first career win at Coors Field, 6-3 over Washington. ... LHP Dontrelle Willis tries to get that elusive first win for Cincinnati on Tuesday. He's made five starts for the Reds and had the bullpen blow save chances in three of them, leaving him 0-1. ... Willis homered in Houston in his last start. He has hit safely in all five starts.