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

LONDON, ENGLAND - NOVEMBER 12: Lukasz Kubot of Poland and Robert Lindstedt of Sweden are congratulates after round robin doubles match against Alexander Peya of Austria and Bruno Soares of Brazil on day four of the Barclays ATP World Tour Finals at the O2 Arena on November 12, 2014 in London, England. (Photo by Julian Finney/Getty Images)

Getty Images Sport Julian Finney