CREATE TABLE table_1506950_9 (us_open VARCHAR, open_ch VARCHAR)

What was the player's result at the U.S. Open of the player who finished 6th at the Open Ch?
SELECT us_open FROM table_1506950_9 WHERE open_ch = "6th"
SELECT "us_open" FROM "table_1506950_9" WHERE "6th" = "open_ch"