MIAMI - Adam Dunn's slump appears to be over.

Dunn homered twice, including a tiebreaking drive in the 10th inning, and Ken Griffey Jr. homered for the third time in five games to lead the Cincinnati Reds over the Florida Marlins 7-6 Tuesday night.

Dunn, in a 1-for-29 slide, was taken out of the starting lineup for Monday's series opener.

''I relaxed and cleared my head,'' he said. ''I had some things worked out in the batting cage. Today, I felt pretty good.''

With the score 5-all in the 10th, Dunn connected off Nate Bump (0-3) for his 14th homer of the season. Wily Mo Pena added an RBI single for a 7-5 lead.

''They're a lot sweeter than when you homer when you're losing by nine,'' said Dunn, who had his second multihomer game of the season and the sixth of his career.

Griffey tied the game 5-5 in the seventh with a solo homer off Matt Perisho, the 495th of his career and 14th this season. Griffey also homered Sunday, moving past Lou Gehrig into 20th place on the career list.

''Hitting is contagious,'' Cincinnati's Sean Casey said.

Mike Mordecai had an RBI single in the bottom of the 10th off Danny Graves, who then retired Larry Sutton on a game-ending flyout for his 25th save in 29 chances.

''Every run we scored was big,'' Reds manager Dave Miley said.

Brian Reith (1-1), Cincinnati's sixth pitcher, got one out for the victory, the Reds' 10th in 13 games. The Reds' bullpen did not allow a hit until the 10th.

''When you get to extra innings, there's no margin for error, and they have more guys who can pop it out of the park than we do,'' Marlins manager Jack McKeon said.

Brought in to face the Reds' power-hitting left-handed hitters, Perisho retired Casey for the second out before surrendering Griffey's homer.

''I stuck to my plan, my plan worked against Casey and my plan worked against Dunn,'' said Perisho, who struck out Dunn to end the inning. ''I just threw a pitch into a hot hitter's swing.''

Reds starter Aaron Harang allowed five runs and 10 hits in five innings, while Florida's Brad Penny gave up four runs and eight hits in six innings.

Mordecai, who had caught only one time previously in his career, entered in the second inning in place of Ramon Castro, who left because of an inflamed right big toe. Mordecai went 3-for-5 in the plate but was 0-for-4 in throwing out runners attempting to steal - D'Angelo Jimenez swiped three bases for Cincinnati. Mordecai's other appearance behind the plate was on April 2, 2001, for Montreal against the Chicago Cubs.

''I catch these guys in the bullpen, so the relievers I've seen,'' Mordecai said. ''It's actually a little easier out there on the field because you don't have all the garbage behind the pitchers in the bullpen like beer signs and umbrellas that you have to battle.''

Regular starter Mike Redmond missed his third straight game because of a bruised right forearm.

After the game, the Marlins said they would place Castro on the 15-day disabled list Wednesday and will call up Matt Treanor from Triple-A Albuquerque.

Dunn's two-run homer and doubles by Jimenez and Jason LaRue gave Cincinnati a 3-0 lead in the second. Dunn had been in a 1-for-29 slide.

Third baseman Ryan Freel threw wide to first baseman Sean Casey for an error on Miguel Cabrera's grounder in the third, allowing Mike Lowell to score from third, and Penny's run-scoring single in the fourth - his first RBI in 29 at-bats this season - pulled Florida to 3-2. Lowell then put Florida ahead with a two-run single.

Barry Larkin tied it with a RBI single in the fifth, but Alex Gonzalez gave Florida a 5-4 lead with a sacrifice fly in the bottom half.

Notes: Mordecai had his first three-hit game of the season. … Lenny Harris was the Marlins' next option at catcher …. Luis Castillo had two hits and is 9-for-20 on the homestand. … Felipe Lopez called up from Triple-A Louisville to replace the injured Juan Castro, went 0-for-2 after entering in the seventh. … Graves has saved 15 of his last 16 chances.