Li crashes out in Qatar
Top seed Li Na crashed out of the Qatar Total Open on Thursday at the hands of qualifier Petra Cetkovska of the Czech Republic.
Li, who will move to a career-high second in the world rankings next week following her Australian Open triumph, lost 6-7 (2/7) 6-2 4-6 in a third-round match lasting two hours and 46 minutes.
Both players committed five double faults and lost their serve twice in a nervy first set which Cetkovska eventually won on the tie-break, before Li hit back to level the match courtesy of two breaks of serve in the second set.
The top seed would have been expected to go and claim victory in the decider but lost her serve three more times as Cetkovska, ranked 134th in the world, claimed a famous win.
There were no such worries for fifth seed Jelena Jankovic, who saw off wild card Alisa Kleybanova 6-1 6-2 in 72 minutes.
Fourth seed Sara Errani had to come from a set down to reach the quarter-finals, the Italian beating Romania's Monica Niculescu 2-6 7-5 6-1, while third seed Petra Kvitova was also pushed all the way by fellow Czech player Lucie Safarova.
Kvitova took the first set on a tie-break before Safarova hit back to level the match, former Wimbledon champion Kvitova then claiming the decider to seal a 7-6 (7/2) 5-7 6-2 success.
Things did not look good for Yanina Wickmayer when she lost the first set of her match against Jana Cepelova 6-1 - however she bounced back in style, taking the next two 6-2 6-0 to progress.
Agnieszka Radwanska was the day's other winner, benefiting from the withdrawal through injury of Mirjana Lucic-Baroni when leading 6-4 0-1.