US tennis coach Mary Joe Fernandez reveals that Venus Williams may be struggling to play on in the Olympics because of illness.

"She's not feeling well. She's been ill for quite a few days. Two days prior to coming here she was really sick with a bad virus. You could probably see she was coughing up a lot. She did everything possible to try and win this match. She got dehydrated. She's cramping a bit and is getting sick to her stomach.

"Now it's just a question of trying to recover and see if she can hydrate and feel better for tomorrow. I'd be highly surprised if she didn't play because this has been her goal for the last four years to come back to her fifth Olympics. She wants to win a medal so badly in anything. Knowing Venus she will be out there no matter how bad she is feeling."