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Santiago played in his first major non-Grand Slam singles tournament on 12 – 15 March 2008 , the Masters Series Pacific Life Open , where he lost to then World No. 2 Rafael Nadal 6 – 3 , 6 – 3 , in the second round .
 Santiago, Rafael Nadal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Santiago, Rafael Nadal