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Agustín Calleri partnered with Potito Starace , but lost in the semifinal s to Marcel Granollers and Alberto Martín .
 Agustín Calleri, Potito Starace, Marcel Granollers, Alberto Martín
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Agustín Calleri, Potito Starace, Marcel Granollers, Alberto Martín