CREATE TABLE table_70920 ("Outcome" TEXT, "Date" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

What is the surface of the score, 7 6 (7 3) , 6 3?
SELECT "Surface" FROM table_70920 WHERE "Score" = '7–6 (7–3) , 6–3'
SELECT "Surface" FROM "table_70920" WHERE "Score" = '7–6 (7–3) , 6–3'