CREATE TABLE table_32052 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents in the final" CLOB, "Score in the final" CLOB)

Tell me the surface for 16 april 2007
SELECT "Surface" FROM table_32052 WHERE "Date" = '16 april 2007'
SELECT "Surface" FROM "table_32052" WHERE "Date" = '16 april 2007'