CREATE TABLE table_78390 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent" CLOB, "Score" CLOB)

What kind of surface was the Tournament at Sunderland played on?
SELECT "Surface" FROM table_78390 WHERE "Tournament" = 'sunderland'
SELECT "Surface" FROM "table_78390" WHERE "Tournament" = 'sunderland'