CREATE TABLE table_177273_2 (surface VARCHAR, score VARCHAR)
SELECT surface FROM table_177273_2 WHERE score = "6–4, 6–4"
เกมนี้เล่นบนพื้นผิวใดด้วยคะแนน 6–4, 6–4?
On what surface was the game played with a score of  6–4, 6–4?