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LONDON, ENGLAND - JUNE 28: Ana Ivanovic of Serbia complains to the umpire Jake Garner about the dark conditions during her Ladies' Singles third round match against Sabine Lisicki of Germany on day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on June 28, 2014 in London, England. (Photo by Steve Bardens/Getty Images)

LONDON, ENGLAND - JUNE 28:  Ana Ivanovic of Serbia complains to the umpire Jake Garner about the dark conditions during her Ladies' Singles third round match against Sabine Lisicki of Germany on day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on June 28, 2014 in London, England.  (Photo by Steve Bardens/Getty Images)