Make an error in the 10th inning, get yanked from the next game's lineup.
That's what happened to Scott Rolen, anyway. Here is Reds manager Dusty Baker's lineup for Game 4 of their Division Series against the Giants:
Scott Rolen made that big error in Game 3, but that's not really why Dusty Baker has replaced him with Todd Frazier in Game 4. It's probably just that Frazier's a really good hitter and needs to start a game every so often.
The other change from Game 3 is at catcher, where switch-hitting Dioner Navarro fills in for Ryan Hanigan
, probably just to give Hanigan a day off, since no advantage is gained against Giants starter Barry Zito
, a left-hander.