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 PERTH, Australia (AP) - Mark Philippoussis could miss the Australian Open after he was forced to retire from a men's singles match at the Hopman Cup on Tuesday with a hyperextended knee.
The Australian, playing Jerome Haehnel of France, injured his knee with Haehnel a point away from taking a 3-1 lead in the first set. After receiving treatment during an injury time-out, Philippoussis lost the next point without even attempting to return the Frenchman's serve.
He retired with the knee injury trailing 4-1 in the first set.
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