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 Vince Spadea of the United States and Novak Djokovic of Serbia both retired from second-round matches with injuries , and when the Argentine outsider Jose Acasuso got a long , deep rub on his left thigh from a trainer because of cramps early in the fifth set of his marathon against Andy Roddick , it looked as if there might be another casualty . 
 nationality: Novak Djokovic, Serbia
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 nationality: Novak Djokovic, Serbia