With Cease getting used yesterday, there are one of two right answers here.
Dunning on a short leash
Foster as an opener
My expectation is that we see Dunning to start and then mix and match as situations present themselves for the rest of the game. The only guy out of the pen who might be limited is Jimmy Cordero who threw 35 pitches yesterday, and you probably don't want to see unless it is an emergency situation anyway. Everyone else should be ready match up by match up, and by situation and score. You have a guy like Rodon if you get down big early to eat some innings, and all of the Sox top set up guys have had minimal usage.
On the A's side, they have Hendricks throwing 49 pitches yesterday, plus Diekman going two days in a row. Also of note is Wendelken throwing 38 pitches in game 1.