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Philippoussis is on course for a third round meeting with world number one Pete Sampras of the United States , whom he beat at the Australian Open last January .
 Australian Open, Philippoussis, United States, Pete Sampras
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Australian Open, Philippoussis, United States, Pete Sampras