CREATE TABLE table_73490 ("Outcome" CLOB, "Year" FLOAT, "Championship" CLOB, "Surface" CLOB, "Opponent in the final" CLOB, "Score in the final" CLOB)

Name the surface for philadelphia
SELECT "Surface" FROM table_73490 WHERE "Championship" = 'Philadelphia'
SELECT "Surface" FROM "table_73490" WHERE "Championship" = 'Philadelphia'