SELECT round_of_64 FROM table_17289604_38 WHERE event = "Singles" AND round_of_16 = "Did not advance" AND athlete = "Iveta Benešová"
Berapa putaran 64 dari acara tunggal ketika hasil babak 16 tidak maju dan atlet itu adalah Iveta Benešová?
CREATE TABLE table_17289604_38 (round_of_64 VARCHAR, athlete VARCHAR, event VARCHAR, round_of_16 VARCHAR)