Flying to a 12.94 World youth best, Jamaicaâ€™s Yanique Thompson captured her nation™s first gold medal in this event during the eight editions of this championship, following their three silver medals at the 2003, 2005 and 2007 events.
The 17-year-old had ran no faster than 13.23 before arriving in Donestk but registered 13.10 in her semi-final winning performance before saving her best for the final.
Pulling clear in the final 10 metres after a blistering start and having cleared all ten barriers with ease, the Jamaican was followed by the USAâ€™s Dior Hall who sped to a 13.01 personal best to take the silver medal ahead of team-mate Mikiah Brisco (13.29) in third with another lifetime best mark.
Seventeen-year-old Hall improved from 13.16 in the semi-final stage â€“ a World youth lead before Thompsonâ€™s 13.10 â€“ and was a semi-finalist at the World Junior Championships in Barcelona last summer.
The previous World youth best for the 76cm-height hurdles was set by Adriana Lamalle of France back in 1999, though in 1979 USAâ€™s Candy Young ran a superior 12.95 over the senior-height hurdles.
Hall and Briscoâ€™s silverware continued the fine US showing in this event, following three gold, one silver and four bronze medals for the USA in the 14-year history of this championship.
In fourth, Jamaicaâ€™s Rushelle Burton clocked a 13.32 personal best, with Swedenâ€™s Adriana Janic close behind in fifth with a 13.33 lifetime best.