Stephens slumps in Dubai
Sloane Stephens, the Australian Open semi-finalist, suffered a first-round defeat to Romania's Sorana Cirstea in the Dubai Duty Free Tennis Championships.
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The American 19-year-old, who defeated Serena Williams on the way to the last four in Melbourne, went down 5-7 6-3 6-2 in just over two hours.
Former world number one Ana Ivanovic claimed a straight-sets victory over Russia's Anastasia Pavlyuchenkova, the Serbian wining 6-3 7-6 (7/5).
France's Marion Bartoli had to come from a set down before seeing off Klara Zakopalova of the Czech Republic 3-6 6-4 6-1.
Laura Robson, the British number two, was beaten by Kazakhstan's Yulia Putintseva 6-4 2-6 7-6 (8/6) in a match lasting close to two-and-a-half hours.
Elsewhere, Taiwan's Hsieh Su-wei swept aside American Varvara Lepchenko 6-1 6-3.