SAN FRANCISCO - Pablo Sandoval hit a two-run double to help Bruce Bochy earn his 1,500th win as a manager, and the San Francisco Giants split a straight doubleheader with the Cincinnati Reds with a 5-3 victory in the nightcap Tuesday.

Hunter Pence hit an RBI single, Gregor Blanco had a sacrifice fly, and Brandon Belt added an RBI groundout in San Francisco's first win in six tries against the Reds this season after being outscored 34-6 in the first five meetings - including 11-0 on Monday night and 9-3 in the opener Tuesday. The Reds had 10 hits after combining for 32 in the first two games.

The teams were forced to make up a July 4 rainout at Great American Ball Park. Cincinnati batted last and wore home uniforms as the visiting team.

Bochy became the 21st manager with 1,500 wins and third active along with Reds skipper Dusty Baker and Detroit's Jim Leyland.

Bochy tipped his cap to the crowd when the milestone was announced as players shook hands afterward.

The Reds called up former Stanford right-hander Greg Reynolds (0-1), a native of nearby Pacifica, from Triple-A Louisville to start the second game. He allowed five runs and eight hits in five innings of his first big league outing since a start Sept. 25, 2011, for Colorado.

Santiago Casilla (4-2) struck out two in 1 1-3 innings for the win, then Sergio Romo recorded the final four outs for his 24th save in 27 opportunities. He struck out Brandon Phillips to end the eighth with two runners aboard, then struck out the side in the ninth after Jay Bruce's leadoff single - including Mesoraco to end it.

Casilla was the third pitcher in relief of struggling lefty Barry Zito, replaced after allowing a pair of two-out hits in the fifth including Todd Frazier's RBI double.

Zito, who won Game 1 of the World Series last fall, saw his winless streak reach nine starts since the lefty beat Oakland on May 30.

Frazier finished with two doubles and three of Cincinnati's hits on a night the Reds missed multiple chances. They stranded 14 baserunners, seven in scoring position. Bruce also had three hits.

The Reds had dominated the Giants this year after allowing San Francisco to rally from an 0-2 deficit to win the NL division series matchup last October.

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