CREATE TABLE table_39168 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent" CLOB, "Score" CLOB)

What is the surface when the tournament is manta, ecuador?
SELECT "Surface" FROM table_39168 WHERE "Tournament" = 'manta, ecuador'
SELECT "Surface" FROM "table_39168" WHERE "Tournament" = 'manta, ecuador'