Australian Open champion Li Na was upset by Czech qualifier Petra Cetkovska 7-6 (2), 2-6, 6-4 in the Qatar Open third round on Thursday.
The top-seeded Li, playing her first tournament since the Australian Open, had a 3-1 lead in the third set.
Li played tentative tennis throughout the 2-hour, 46-minute match.
This marks the eighth time Cetkovska has beaten a top-10 player. It's only the second time she's beaten a top-three ranked player - she upset the then third-ranked Agnieszka Radwanska at the 2011 Rome tournament.