CREATE TABLE "doubles_titles_21" (
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);

Question: On what type of surface was the tournament of Italy f28?
SQL: SELECT "surface" FROM "doubles_titles_21" WHERE "tournament"='italy f28';

Question: Who was the opponent in the final of the Senegal f2 tournament>
SQL: SELECT "opponent_in_the_final" FROM "doubles_titles_21" WHERE "tournament"='senegal f2';