Barclays ATP World Tour Finals - Day Seven [Getty Images]

LONDON, ENGLAND - NOVEMBER 15: Roger Federer of Switzerland shakes hands with Stan Wawrinka of Switzerland afte the singles semi-final match on day seven of the Barclays ATP World Tour Finals at O2 Arena on November 15, 2014 in London, England. (Photo by Clive Brunskill/Getty Images)

Getty Images Sport Clive Brunskill