DOHA: World N.2 and top seed Angelique Kerber crashed out of the Qatar Total Open, going down 4-6, 6-0, 4-6 to Russia's Daria Kasatkina at the Khalifa International Tennis Complex here on Thursday.
The former world No.1, who had received a bye in the first round, looked completely out of sorts against her opponent who had defeated her earlier in the year at the WTA tournament in Sydney.
"It's my second year on the WTA Tour, so I have to grow up!" laughed Kasatkina in her on-court interview after reaching the last-eight stage.
It is for the second year in a row that Kerber is bowing out of the Qatar Total Open without reaching the quarterfinals.
Meanwhile Caroline Wozniacki's quarterfinal clash against American qualifier Lauren Davis was stopped because of rain after the pair managed only one game on a side court .
Earlier the Dane had beaten close friend Agnieszka Radwanska 7-5, 6-3.
"We always have great matches," said the Dane afterwards. "It was a tough match but I was pleased."
Only one player, Slovakia's Dominika Cibulkova, has so far won through to the semifinals as rain has decimated the schedule.
She beat Australia's Samantha Stosur 7-5, 6-4, and will play the winner of the match between the Czech Republic's Karolina Pliskova and China's Zhang Shuai.
Pliskova, the number two seed, had earlier on Thursday beaten France's Caroline Garcia 7-5, 6-4.
Dominika Cibulkova (SVK x3) bt Samantha Stosur (AUS) 7-5, 6-4
Darya Kasatkina (RUS) bt Angelique Kerber (GER x1) 6-4, 0-6, 6-4
Caroline Wozniacki (DEN) bt Agnieszka Radwanska (POL x4) 7-5, 6-3
Lauren Davis (USA) bt Elena Vesnina (RUS x6) 7-5, 6-2
Samantha Stosur (AUS) bt Barbora Strýcová (CZE x8) 6-3, 3-6, 6-4
Karolína Plíšková (CZE x2) bt Caroline Garcia (FRA) 7-5, 6-4