US sprinter Jessica Young won in 7.30 .
Second in the same time was the Polish junior Ewa Swoboda who also clocked 7.30 in her heat and both times are national junior records .
US sprinter Jessica Young won in 7.30 but second in the same time was the Polish junior Ewa Swoboda who also clocked 7.30 in her heat and both times are national junior records .