CREATE TABLE table_71574 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Who played on clay and had a score of 6 1, 7 6?
SELECT "Opponent" FROM table_71574 WHERE "Surface" = 'clay' AND "Score" = '6–1, 7–6'
SELECT "Opponent" FROM "table_71574" WHERE "Score" = '6–1, 7–6' AND "Surface" = 'clay'