What is Surface, when Date is 2 May 1999?
CREATE TABLE "singles_finals_10_7_3" (
  "outcome" text,
  "date" text,
  "location" text,
  "surface" text,
  "opponent_in_final" text,
  "score" text
);
SELECT "surface" FROM "singles_finals_10_7_3" WHERE "date"='2 may 1999';