Li Na told the press that early in the third set when she injured her ankle, her head hit the court and for a moment she blacked out. That, my friends, is called a concussion. That she was allowed to continue running and bouncing around on the court could be construed as gross negligence on the part of the tournament directors, putting her at risk of further neurologic injury. Is there a doctor at courtside? There should be, and he should examine players who fall to the court and hit their heads. A comparable head trauma in any other sport usually puts the athlete out of commission immediately, and subsequently anywhere from one to several weeks.