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Andy Roddick was the defending champion , but Roger Federer defeated him 7 – 5 , 6 – 3 , in the final .
 Andy Roddick, Roger Federer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Andy Roddick, Roger Federer