CREATE TABLE table_68553 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Which opponent has a Score of 6 4, 3 6, 6 3?
SELECT "Opponent" FROM table_68553 WHERE "Score" = '6–4, 3–6, 6–3'
SELECT "Opponent" FROM "table_68553" WHERE "Score" = '6–4, 3–6, 6–3'