New York: Two-time Wimbledon champion Petra Kvitova said she will seek more medical advice after a fresh bout of exhaustion struck in her US Open quarter-final exit.
The fifth-seeded Czech was diagnosed with mononucleosis earlier in the summer but was cleared to play the hardcourt season by doctors.
Earlier in 2015, she had taken six weeks off the tour, citing exhaustion.
On Wednesday, the 25-year-old slumped to a 4-6, 6-4, 6-2 defeat to Italian veteran Flavia Pennetta and admitted she will return to her doctors before making a decision on whether or not to take part in the upcoming Asian swing.
"I`m going back to make some blood tests, to see how everything is looking right now," she said.
"Now I`m feeling really exhausted, so I`m really glad I can sit down now. I am going talk with the doctors again and see how everything is working, but if I`m okay I will go there (Wuhan and Beijing), for sure."
Kvitova had reached the US Open quarter-finals for the first time, having already made at least the last-four stage of the other three majors.
She hadn`t dropped a set in her first four matches at the tournament and had won three of her last four meetings with Pennetta.
But she was plagued by mistakes on Arthur Ashe Stadium court, suffering nine double faults and 60 unforced errors.
Pennetta, a picture of guile and steadiness, made just 16 unforced errors.
Kvitova said she had come into the tie feeling tired after failing to sleep well the night before.
"Actually, I couldn`t fall asleep last night, so it was kind of difficult anyway," she said as she slumped in her chair in the media conference room.
"When I heard my alarm I didn`t want to wake up. Yeah, I`m kind of sleepy right now, as well."
Kvitova had arrived in New York fresh from a third New Haven title triumph in four years.
However, three of her five opponents in New York were ranked outside the top 90 and her ring rustiness was exploited by Pennetta, who has now reached her second US Open semi-final.
"I will take positive things, for sure, it`s kind of in the mind that even I wasn`t 100 percent ready, my body wasn`t really ready, I was still able to play really good tennis," she said.
"Another positive is that I played a lot of matches, as well. It`s great to have it, because the last couple of months I didn`t really have that many."