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He played in the 2008 French Open after the withdrawal of home-favourite Richard Gasquet through injury , but he had lost in the first round against Florent Serra of France .
 Richard Gasquet, Florent Serra
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Richard Gasquet, Florent Serra