CREATE TABLE "singles_titles" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);

Question: Which tournament did the opponent Guillermo Carry play?
SQL: SELECT "tournament" FROM "singles_titles" WHERE "opponent"='guillermo carry';

Question: Who was the opponent on April 21, 2008?
SQL: SELECT "opponent" FROM "singles_titles" WHERE "date"='april 21, 2008';

Question: Who is the opponent on November 22, 2009, clay surface?
SQL: SELECT "opponent" FROM "singles_titles" WHERE "surface"='clay' AND "date"='november 22, 2009';