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LONDON, ENGLAND - JULY 04: Jelena Jankovic of Serbia celebrates match point in her Ladies Singles third Round match against Petra Kvitova of Czech Republic during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JULY 04:  Jelena Jankovic of Serbia celebrates match point in her Ladies Singles third Round match against Petra Kvitova of Czech Republic during day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 4, 2015 in London, England.  (Photo by Clive Brunskill/Getty Images)