Scott Sizemore suffered a torn ACL in his left knee and will miss the entire 2012 season. Brutal news for Sizemore, who played well after being acquired from the Tigers last season and was set to serve as the A's starting third baseman in 2012. The 27-year-old will be reevaluated in two weeks before a date is set for surgery. The A's will likely look at Josh Donaldson, Adam Rosales, Eric Sogard and Wes Timmons as possible replacements at the hot corner.