Question: Which tournament did the opponent Guillermo Carry play?
SQL: SELECT "Tournament" FROM "2-16773017-6" WHERE "Opponent" = 'Guillermo Carry';

Question: Who was the opponent on April 21, 2008?
SQL: SELECT "Opponent" FROM "2-16773017-6" WHERE "Date" = 'April 21, 2008';

Question: Who is the opponent on November 22, 2009, Clay surface?
SQL: SELECT "Opponent" FROM "2-16773017-6" WHERE "Surface" = 'Clay' AND "Date" = 'November 22, 2009';