CREATE TABLE table_name_10 (hard VARCHAR(255), record VARCHAR(255), carpet VARCHAR(255), clay VARCHAR(255), grass VARCHAR(255))
Which hard has a Clay of 0–0, Grass of 0–0,  Carpet of 0–0, and a Record of 1–0?
    
SQL: SELECT hard FROM table_name_10 WHERE clay = "0–0" AND grass = "0–0" AND carpet = "0–0" AND record = "1–0"