what's the total number of singles w-l with doubles w-l of 0–0 and total w-l of 3–1
create table table_10023387_1 (singles_w_l varchar, doubles_w_l varchar, total_w_l varchar, PRIMARY KEY (singles_w_l))
select count(singles_w_l) from table_10023387_1 where doubles_w_l = "0–0" and total_w_l = "3–1"