See vids . . .
Azarenka statement about the collapse. I was warming up in the gym prior to my match against Gisela Dulko when I fell while running a sprint. I fell forward and hit my arm and head.
I was checked by the medical team before I went on court and they were courtside for monitoring.
I felt worse as the match went on, having a headache and feeling dizzy. I also started having trouble seeing and felt weak before I fell. I was taken to the hospital for some medical tests and have been diagnosed with a mild concussion.”
090110 / US Open