CREATE TABLE "singles_6" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponen" text,
  "score" text
);

Question: Which Surface has a Date of january 2, 2006?
SQL: SELECT "surface" FROM "singles_6" WHERE "date"='january 2, 2006';

Question: Which tournament happened on september 25, 2006?
SQL: SELECT "tournament" FROM "singles_6" WHERE "date"='september 25, 2006';

Question: When did joão souza play?
SQL: SELECT "date" FROM "singles_6" WHERE "opponen"='joão souza';

Question: Which Surface has a Score of 7–5, 6–4?
SQL: SELECT "surface" FROM "singles_6" WHERE "score"='7–5, 6–4';