"We think he could use a break and get some rest," Bochy said. "With [Thursday] off, it gives him a couple days off. I think it's important he gets a day.
"He's just been playing a lot. He played both yesterday. With a catcher, I like to find a time to give two days off."
Posey has appeared in 79 games as a catcher and 16 as a first baseman in 2013. After starting at first base in Game 1 on Tuesday, he played behind the plate in Game 2. Counting his two games at designated hitter, Posey has appeared in 97 of the Giants' 100 games this season and is making a case for a second consecutive National League Most Valuable Player Award.