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Australian Davis Cup captain John Newcombe on Thursday signalled his possible resignation if his team loses an away tie against Croatia next month .
 Davis Cup, John Newcombe, Australian, Croatia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Davis Cup, John Newcombe, Australian, Croatia