I just couldn't breathe. I don't know what happened.

I'm very, very disappointed. But it's early in the year and hopefully things will get better.

But it's always a player's decision and I kept telling her I didn't want to quit even though I was panicking.

The trainer was telling me to stop because it was dangerous if it gets into the heart,

[By the time she conceded the match, she was hyperventilating in the courtside chair. She was wheeled away from the court and later was put on a drip.] I just couldn't breathe, ... I don't know what happened.

My whole body was cramping. I thought it would get better, but I could not even walk. Obviously I panicked a little bit.