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At Wimbledon , he reached the fourth round in 1953 when he was in the fifth set against in his compatriot Ken Rosewall , whom he had lost against previously .
 Wimbledon, Ken Rosewall
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, Ken Rosewall