CREATE TABLE table_name_36 (surface VARCHAR, score VARCHAR, date VARCHAR)

What surface was played on with a score of 6 4, 6 3 and on 4 May 1992?
SELECT surface FROM table_name_36 WHERE score = "6–4, 6–3" AND date = "4 may 1992"
SELECT "surface" FROM "table_name_36" WHERE "4 may 1992" = "date" AND "6–4, 6–3" = "score"