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Jesse Huta Galung was the defending champion , but he lost to Albert Ramos-Viñolas in the first round .
 Jesse Huta Galung, Albert Ramos-Viñolas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jesse Huta Galung, Albert Ramos-Viñolas