Which clay has a Record of 2–0, and a Hard 1–0?
CREATE TABLE "head_to_head_record" (
  "record" text,
  "hard" text,
  "clay" text,
  "grass" text,
  "carpet" text
);
SELECT "clay" FROM "head_to_head_record" WHERE "record"='2–0' AND "hard"='1–0';