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The men 's field featured World No. 1 , Australian Open and Wimbledon winner Roger Federer , French Open champion and 2005 Canada Masters winner Rafael Nadal , and ATP No. 3 David Nalbandian .
 Roger Federer, Rafael Nadal, ATP, David Nalbandian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Roger Federer, Rafael Nadal, ATP, David Nalbandian