Johnny Cueto to start Game 1
Cueto went 19-9 this season with a 2.78 ERA.
The first two games in the best-of-five series will be played Saturday and Sunday in San Francisco.
Baker had been setting up the rotation well in advance of the series opener.
Copyright 2012 by The Associated Press
MORE MLB HEADLINES
- A's trade Donaldson to Toronto for Lawrie
- Report: Cuban slugger to D-backs for $68.5M
- Cubs: Strop avoids injury in car accident
- Frasor, Royals reach one-year, $1.8M deal