SELECT hard FROM table_name_10 WHERE clay = "0–0" AND grass = "0–0" AND carpet = "0–0" AND record = "1–0"
Hard mana yang memiliki tanah liat 0–0, rumput 0–0, karpet 0–0, dan rekor 1-0?
CREATE TABLE table_name_10 (hard VARCHAR, record VARCHAR, carpet VARCHAR, clay VARCHAR, grass VARCHAR)