Reds 6, Mets 1: Scott Rolen and Todd Frazier hit back-to-back homers and Mike Leake tossed a complete-game four-hitter as host Cincinnati extended its winning streak to five games.

Jay Bruce also homered, his third in as many games, and the Reds denied New York knuckleballer R.A. Dickey's bid to become the first 16-game winner in the majors.

Leake (5-7) went the distance for the second time this season to earn his second home win in 13 starts and first at Great American Ball Park since May 21. He also chipped in an RBI single in the fifth to help Cincinnati improve to a major league-best 38-20 at home.

Dickey (15-4) was tagged for a season high-tying three homers and five runs on 10 hits in six innings as the Mets dropped seven games under .500 for the first time this season.

With the scored tied at 1-1 in the fourth, Rolen homered off Dickey in his first game in eight days. Frazier, who had three hits, followed with a cannon shot off Dickey, crushing a 76 mile-per-hour knuckler 474 feet to center for a 3-1 lead.

Bruce, who clubbed a walk-off homer in the ninth inning to win Tuesday's series opener, continued the long ball parade with a solo shot in the sixth for his 24th of the year.

The Mets scored their lone run in the fourth on Daniel Murphy's double-play groundout, ending a 28-inning scoreless streak by Cincinnati pitching.

GAME NOTEBOOK: Dickey struck out nine to take over the National League lead with 175 - one shy of Detroit's Max Scherzer. ... Frazier's homer was the fourth-longest in the majors this season and the 10th-longest in the history of Great American Ball Park. ... The Mets activated C Kelly Shoppach and sent C Rob Johnson to Triple-A Buffalo. Shoppach was acquired from Boston on Tuesday. ... Cincinnati's 28-inning scoreless streak was its longest since a 32-inning stretch in June 1963. ... The Mets will switch to a six-man rotation effectively immediately, although Dickey will pitch every fifth game. ... The Reds improved to 49-20 when scoring first.