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Sept 30 (Reuters) - Victoria Azarenka's China Open title defence wilted in the first round when the Belarussian lost to Germany's Andrea Petkovic 6-4 2-6 6-4 on Monday.
Azarenka's 15 double faults, to go with 44 unforced errors, mirrored her erratic display over two hours 22 minutes against Petkovic who appeared to be feeling dizzy in the second set.
The loss for second seed Azarenka followed her second-round defeat by Venus Williams in Tokyo last week.
Petkovic looked in discomfort in the second set, needing medical time out, and she lost seven straight games as Azarenka forced the decider.
The defending champion traded breaks with Petkovic to level at 4-4 in the third set but her 15th double fault on break point left the German serving for the match. (Reporting by Amlan Chakraborty in New Delhi, editing by Clare Fallon)