Former Grand Slam champion and coach of Japan's Kei NIshikori, Michael Chang watches Nishikori play Rafael Nadal of Spain in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Former Grand Slam champion and coach of Japan's Kei NIshikori, Michael Chang watches Nishikori play Rafael Nadal of Spain in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)

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