Table schema:
CREATE TABLE table_10023387_1 (singles_w_l VARCHAR, doubles_w_l VARCHAR, total_w_l VARCHAR)

Question: what's the total number of singles w-l with doubles w-l of 0–0 and total w-l of 3–1
SQL: SELECT COUNT(singles_w_l) FROM table_10023387_1 WHERE doubles_w_l = "0–0" AND total_w_l = "3–1"