Petra Kvitova will undergo a series of tests to determine the reason for her recurring illness. The Czech caught a virus two days ago and was forced to stay in bed on Friday. She had little energy in her 6-3, 6-0 loss to Alison Riske at the U.S. Open on Saturday.
This is believed to be the third virus that the 2011 Wimbledon champion has caught this year. Late last fall, she acknowledged having four different viruses in 2012. She will undergo blood tests in Manhattan. A member of her camp said she was “bitterly disappointed” to be unable to compete at her top level.