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

Australian Open Tennis

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

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