The Giants took their first lead of the series in the fifth when Blanco drew a two-out walk and Abreu followed with a 442-foot blast into the upper deck in left field on Cingrani's 1-1 pitch. The homer was Abreu's first since last Sept. 16 for Kansas City against the Angels.
Cingrani, making his eighth start of the season and first since Johnny Cueto went on the disabled list June 29 with a strained back muscle, allowed four hits and two runs with four walks and five strikeouts in 5 2-3 innings. His walks were a single-game career high as a starter.
Zito left the game after Choo and Zack Cozart led off the fifth with singles. Zito allowed seven hits and one run with a walk and three strikeouts.
Heisey, on the disabled list from April 29 to June 25 with a strained right hamstring, tied the game with a 422-foot solo homer into the left field seats on a one-strike pitch from George Kontos. The homer was Heisey's third of the season and first since April 23 against the Cubs in Cincinnati.
"It seemed like Heisey had no interest in the fastball," Kontos said. "It was a slider low and away. Unfortunately, it didn't bounce. He hit it off his front foot, and it carried. It is definitely frustrating."
NOTES: Heisey made his first start in the field since coming off the disabled list on June 25. Heisey started at designated hitter in one game each at Texas and Oakland on Cincinnati's last road trip. ... The sellout crowd that showed up for Frazier's bobblehead night and postgame fireworks was Cincinnati's ninth of the season. The team had a club-record 15 last season. ... Tightness in Marco Scutaro's back prompted Giants' manager Bruce Bochy to give the second baseman Wednesday night off. ... RHP Matt Cain is scheduled to start for San Francisco against RHP Mike Leake in Thursday's finale of the four-game series.