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After suffering from sciatica caused by two bulging discs in his back , a spondylolisthesis ( vertebral displacement ) and a bone spur that interfered with the nerve , Agassi retired from professional tennis on September 3 , 2006 , after losing in the third round of the US Open to Benjamin Becker .
 Agassi, Benjamin Becker
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Agassi, Benjamin Becker