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:
1. Brandon Phillips - 2B
2. Zack Cozart - SS
3. Joey Votto* - 1B
4. Ryan Ludwick (R) LF
5. Jay Bruce* - RF
6. Todd Frazier - 3B
7. Dioner Navarro# - C
8. Drew Stubbs - CF
9. Mike Leake - P
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.