Pinch hitter Joe Morgan blooped a two-run single with one out in the top of the 10th inning to bring San Francisco its first victory in four games.
Reggie Smith opened the Giant 10th with a single off Cincinnati reliever Tom Hume. A walk, sacrifice and intentional pass set up Morgan, and he lofted the ball just out of the reach of left fielder Eddie Milner.
Asked if beating his former Cincinnati teammates meant anything special to him, Morgan replied, "Nothing here means anything to me, if you want to know the truth."
The Giants had built a 5-3 lead with the help of home runs by Chili Davis, leading off the game against Cincinnati's Mario Soto, and Jack Clark, but had to rally in the eighth for a 5-5 tie. They did so on a single by Clark, an error, a passed ball, Darrell Evans' RBI single greeting reliever Joe Price, Jeff Leonard's single, a walk and Dave Bergman's pinch-hit sacrifice fly.
"We needed a break to get started, and we got one," said Morgan.
"Sometimes the first win is the toughest, especially when you start bad. Once things don't start right, you start trying harder and pressing."the Cardinals before the home opener, but signed a new three-year contract as field manager. Joe McDonald, former New York Mets general manager who had been the executive assistant to Herzog, assumed the general manager job.