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Ernests Gulbis won in the final 6 – 2 , 6 – 3 against Ivo Karlović .
 Ernests Gulbis, Ivo Karlović
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ernests Gulbis, Ivo Karlović