Usain Bolt holds world records for the 200 meter event under-20 and under-18.
Usain Bolt . He has twice broken the 200 metres world record , setting 19.30 in 2008 and 19.19 in 2009 . The 2008 Olympics was his international debut over 100 m ; he had earlier won numerous 200 m medals ( including 2007 World Championship silver ) and holds the world under-20 and world under-18 records for the event .