CREATE TABLE table_25158 ("Outcome" TEXT, "Year" FLOAT, "Championship" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

Name the surface for 6 0, 6 3
SELECT "Surface" FROM table_25158 WHERE "Score in the final" = '6–0, 6–3'
SELECT "Surface" FROM "table_25158" WHERE "Score in the final" = '6–0, 6–3'