New York 's Usain Bolt sets 100m world record of 9.72 seconds in Jamaica . Jamaican Asafa Powell held the previous world record of 9.74 seconds . He faces a showdown at the end of June with Powell at the Jamaican national championshps . World champion Tyson Gay of Jamaica finishes sixth in 9.85 seconds .
New York 's Usain Bolt sets 100m world record of 9.72 seconds in Jamaica . Jamaican Asafa Powell held the previous world record of 9.74 seconds . World champion Tyson Gay of Jamaica finishes sixth in 9.85 seconds .