CREATE TABLE table_62116 ("Outcome" TEXT, "Date" TEXT, "Championship" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What type of surface did they play on 21 July 1997
SELECT "Surface" FROM table_62116 WHERE "Date" = '21 july 1997'
SELECT "Surface" FROM "table_62116" WHERE "Date" = '21 july 1997'