Maybe a little extra rest did Novak Djokovic some good.
Everyone should know the answer to that sometime Friday afternoon.
That's when Djokovic, the U.S Open's defending champion and No. 1 seed, is scheduled to play his third-round match in Arthur Ashe Stadium against Mikhail Youzhny.
Djokovic hasn't played a point since Monday, when he experienced problems with his right arm. He was massaged by a trainer after only five games, then repeatedly shook that arm or flexed his elbow and grimaced following serves, even the ones that were far slower than he usually hits.
He also dropped a set in an opening-round Grand Slam match for the first time since 2010.