Josh Donaldson will get the first crack at filling the Athletics' vacancy at third base. "This is his opportunity," assistant general manager David Forst said Tuesday. Donaldson, who has played primarily at catcher during his baseball career, posted a .261/.344/.439 batting line with 17 home runs and 70 RBI in 115 games last season for Triple-A Sacramento. He won't carry any mixed league fantasy value, no matter how the competition at the hot corner shakes out.