CREATE TABLE table_50189 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Who was the Opponent in the match with a Score of 6 3, 6 4?
SELECT "Opponent" FROM table_50189 WHERE "Score" = '6–3, 6–4'
SELECT "Opponent" FROM "table_50189" WHERE "Score" = '6–3, 6–4'