CREATE TABLE table_45440 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Who was the opponent in the math that was played in Nice on a clay court?
SELECT "Opponent" FROM table_45440 WHERE "Surface" = 'clay' AND "Tournament" = 'nice'
SELECT "Opponent" FROM "table_45440" WHERE "Surface" = 'clay' AND "Tournament" = 'nice'