Originally Posted by El Diablo
^^ The match should have ended and Azarenka declared winner by default. This was a concussion. Head trauma followed by even the briefest blanking out is a concussion. To continue athletic activity at that time or for at least days thereafter is absolutely medically contraindicated.
I agree with you. I fell and hit the back of my head like that a few years ago, blacked out, suffered a concussion and was out of it (not knowing where I was) for approximately 20-40 minutes afterwards.
There was a doctor on the court who checked her for signs of a concussion, but you are right blacking out is a definite sign of a concussion and the match should have been stopped.