Boris Becker, rear center, 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/Andrew Brownbill)

Australian Open Tennis

Boris Becker, rear center, 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/Andrew Brownbill)

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