Kvitova faces tests after being scuppered by illness
Former Wimbledon champion Kvitova revealed after the 6-3 6-0 defeat that she has been struggling with a virus and will have more blood tests before returning home.
The seventh seed said: “Unfortunately I was lying in bed yesterday and I had a fever, so I didn’t come to site yesterday.
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Hide Ad“My body didn’t help me to move. I tried to play, I tried to fight, but my body wouldn’t let me fight.
“It’s unlucky at a grand slam. I will take it for this year and next year will be better.”
Kvitova suffered from a similar problem at Wimbledon this year, where she lost in the quarter-finals to Kirsten Flipkens.
Riske, who was ranked outside the top 200 in February, has had a rapid rise and second seed Victoria Azarenka, who was also involved in a major battle against France’s Alize Cornet before coming through 6-7 (2/7) 6-3 6-2.