What is every surface with a score in the final of 6–4, 6–7 (1–7) , 6–7 (4–7) , 4–6?
create table table_23235767_1 (surface varchar, score_in_the_final varchar, PRIMARY KEY (surface))
select surface from table_23235767_1 where score_in_the_final = "6–4, 6–7 (1–7) , 6–7 (4–7) , 4–6"