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LONDON, ENGLAND - JUNE 17: Stanislas Wawrinka of Switzerland looks dejected in his men's singles second round match against Kevin Anderson of South Africa during day three of the Aegon Championships at Queen's Club on June 17, 2015 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JUNE 17:  Stanislas Wawrinka of Switzerland looks dejected in his men's singles second round match against Kevin Anderson of South Africa during day three of the Aegon Championships at Queen's Club on June 17, 2015 in London, England.  (Photo by Clive Brunskill/Getty Images)