A basic-as-it-gets rally finally finished it.
The Reds scored four times in the fifth off John Maine (8-7) despite getting only two balls out of the infield. Ken Griffey Jr. drew a bases-loaded walk, Brandon Phillips lofted a two-run single into shallow right field, and Edwin Encarnacion got hit by a pitch with the bases loaded.
Jay Bruce hit a solo homer off Maine, who has failed to last five innings in three of his last four starts.
Arroyo (8-7) has been extremely streaky this season. The right-hander is in one of his upturns, winning his last four starts. The majors' hottest team managed only four hits off Arroyo, including Carlos Beltran's RBI double.
The eight innings matched Arroyo's longest performance of the season.
Francisco Cordero, who blew a two-run lead in the ninth inning Thursday night, gave up a walk in the ninth before finishing it off for his 20th save in 25 chances.
Exquisite starting pitching was the foundation of the Mets' surge. Their staff threw four shutouts in the last six games before the All-Star break, but hasn't been the same since. The Mets blew two leads in their 10-8 win Thursday night, and Maine gave the Reds plenty of assistance during their decisive rally on Friday.
The Reds loaded the bases on Paul Bako's single, Bruce's walk and Jeff Keppinger's infield single with two outs. Griffey fouled off a 94 mph fastball with a full count to extend his at-bat, then took one low and away to force in a run. Phillips got just enough of a pitch to loft it over the head of first baseman Carlos Delgado for two more runs.