CREATE TABLE table_41545 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

What is the date that has yani tseng as the runner (s)-up?
SELECT "Date" FROM table_41545 WHERE "Runner(s)-up" = 'yani tseng'
SELECT "Date" FROM "table_41545" WHERE "Runner(s)-up" = 'yani tseng'