Posey explained he has tried to wrap his hand around the very top of the baseball, not its side. This, Posey said, enables his throws to travel with better carry. He added, "You're going to get truer flight on the ball instead of maybe some tailing."
Posey said he has concentrated on employing this technique when he throws during the offseason.
Giants pitchers have eased Posey's task by holding runners on base more effectively. This wasn't always one of the team's hallmarks in recent seasons.
"It starts with the pitcher," manager Bruce Bochy said.
San Francisco had permitted 40 stolen bases entering Sunday, the NL's second-lowest total.
Chris Haft has covered the Giants since 2005, and for MLB.com since 2007. Follow him on Twitter at @sfgiantsbeat and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.