Boris Becker, former Grand Slam champion and coach of Novak Djokovic, claps hands during Djokovic's quarterfinal against Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)

Australian Open Tennis

Boris Becker, former Grand Slam champion and coach of Novak Djokovic, claps hands during Djokovic's quarterfinal against Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 21, 2014.(AP Photo/Rick Rycroft)

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