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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: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 nationality: Novak Djokovic, Serbia