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However , he did reach the semi-finals of the mixed doubles at Wimbledon with his regular partner Liezel Huber .
 Wimbledon, Liezel Huber
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Wimbledon, Liezel Huber