Athletics pitcher Rich Harden will be sidelined for two weeks with a stiff lat muscle below his pitching arm. He experienced the stiffness while trying to throw on Tuesday. "We evaluated him the last two days," manager Bob Geren said. "I just look at it as a setback. I don't look at it as terrible news. ... We'll see when he gets pain-free. It definitely could affect that fifth starter spot. Hopefully it's just a minor setback."