World No. 1 Ashleigh Barty was upset by late substitute Kiki Bertens 3-6, 6-3, 6-4 at the WTA Finals on Tuesday.
The tournament, which also includes a doubles event featuring the year's top eight teams, has a record total prize fund of £10.8m.
She broke into tears during a coaching time-out-very out of character for the Dutch woman-and finally asked to see the doctor after the first game of the second set.
"It was pretty hard from the baseline to play with her rallies", Kvitova said. I was thinking maybe she wins the first set, maybe a different story. The Australian's chances of getting past the group stages were boosted, but eventually, she was stunned by the tired Bertens in three sets, throwing the group wide open once again.
In the later match, Belinda Bencic fought back from a second-set spiral to beat Petra Kvitova 6-3, 1-6, 6-4 in one hour and 47 minutes.
Osaka said the injury surfaced in Beijing this month. Neither player has looked at their best in this tournament but I with less pressure, I feel Kvitova will be able to fully express her ability. "(I felt) a little bit dizzy".
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Svitolina, the only player in this year's field who has not won a title this season, was unbeaten in the tournament last year. Pliskova said she was excited about her upcoming must-win match against Halep.
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At that moment, he was resolved that his fight against Jorge Masvidal was off. "I thought it was all made up and a bunch of bulls*** anyway", Diaz.
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Andreescu said: "I had a scan Thursday to check my knee after last night's match, and unfortunately the results show that I need to withdraw".
Kiki Bertens hits a shot to Ashleigh Barty during the WTA Finals in Shenzhen, China, on October 29, 2019.
The 29-year-old Kvitova, the oldest player in the draw, changed tactics early in the second set and attacked the net but Barty had the answers to reach the semifinals on her WTA Finals debut. "I knew if I didn t win this match that I m eliminated, but I didn t think about it". Defending champion Elina Svitolina has already booked her spot in the last four but instead of meeting Andreescu, will take on second alternate Sofia Kenin of the US.
She won the Australian Open in January and was ranked world No. 1 in the world before putting a drop-off in form mid-season behind her with tournament wins at the Pan Pacific Open in Japan and the China Open. "Last year during the off-season, I trained really hard for Australia".
"I think definitely she was dictating the game today".
"I just couldn't find any rhythm", she said. Even though it ended prematurely, Osaka was pleased with her back end to the season after a tough stretch where she suffered a stunning first-round exit at Wimbledon followed by a lacklustre US Open title defence.