Former Grand Slam champion Boris Becker of Germany, right, also coach of Novak Djokovic of Serbia, watches Djokovic play Fabio Fognini of Italy during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Former Grand Slam champion Boris Becker of Germany, right, also coach of Novak Djokovic of Serbia, watches Djokovic play Fabio Fognini of Italy during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Eugene Hoshiko)

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