Buckeyes freshman RB Maurice Clarett underwent arthroscopic knee surgery Tuesday morning, after ostensibly re-aggravating an old injury in the 1st quarter of Ohio State's victory over Washington State this past weekend. A team doctor said Tuesday that it's unlikely but not impossible for Clarett to play this Saturday against Cincinnati. Buckeyes head coach Jim Tressel said he'll wait to pass judgement until Thursday, when Clarett may be able to practice.