CREATE TABLE table_71575 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Who played on clay on 3 march 2012?
SELECT "Opponent" FROM table_71575 WHERE "Surface" = 'clay' AND "Date" = '3 march 2012'
SELECT "Opponent" FROM "table_71575" WHERE "Date" = '3 march 2012' AND "Surface" = 'clay'