question: Which hard has a Clay of 0–0, Grass of 0–0,  Carpet of 0–0, and a Record of 1–0?
answer: SELECT hard FROM table_name_10 WHERE clay = "0–0" AND grass = "0–0" AND carpet = "0–0" AND record = "1–0"
context: CREATE TABLE table_name_10 (hard VARCHAR, record VARCHAR, carpet VARCHAR, clay VARCHAR, grass VARCHAR)