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

Question: What was the surface for Adrian Ungur as an opponent?
SQL: SELECT "surface" FROM "singles_titles" WHERE "opponent"='adrian ungur';

Question: What was the score on a clay surface on May 29, 2006?
SQL: SELECT "score" FROM "singles_titles" WHERE "surface"='clay' AND "date"='may 29, 2006';

Question: Which tournament had a score of 6–3, 7–6?
SQL: SELECT "tournament" FROM "singles_titles" WHERE "score"='6–3, 7–6';

Question: On what surface was the opponent Michael Berrer?
SQL: SELECT "surface" FROM "singles_titles" WHERE "opponent"='michael berrer';