209066
Tennis career Solomon began playing tennis at the age of five , and as a junior player he was ranked as high as No. 2 in the United States in the 14 , 16 , and 18 age groups , and won the U.S. Boys 18 Clay Court Championship .
 Tennis, Solomon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tennis, Solomon