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LONDON, ENGLAND - JUNE 14: Stan Wawrinka of Switzerland in action during a practice session ahead of the Aegon Championships at the Queens Club on June 14, 2015 in London, England. (Photo by Jordan Mansfield/Getty Images for LTA)

LONDON, ENGLAND - JUNE 14:  Stan Wawrinka of Switzerland in action during a practice session ahead of the Aegon Championships at the Queens Club on June 14, 2015 in London, England.  (Photo by Jordan Mansfield/Getty Images for LTA)