Great Britain's Laura Robson crashed out of the Qatar Open in the first round after a straight sets defeat to Daniela Hantuchova in Doha.
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The world number 45 lost 6-4 6-1 to the Slovakian, who despatched Robson in just one hour and 16 minutes including six aces. In the second round world number two Serena Williams beat Russian Daria Gavrilova 6-2 6-1. Maria Sharapova beat Caroline Garcia of France 6-3 6-2.
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British number two Robson, who last week helped Great Britain secure a place in the Fed Cup play off in April, fell victim to some powerful serving from Hantuchova who broke the 19-year-old six times.
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Second-seed Williams, who will reclaim the number one position if she reaches the semi-finals, breezed past the 160th-ranked Gavrilova in 54 minutes.
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The 15-times Grand Slam winner, who has not topped the rankings since October 2010, showed no signs of the back and ankle injuries that hampered her as she lost in the Australian Open quarter-final last month.