Jamaica 's Alex Bolt sets 100 m world record of 9.72 seconds in New York . Fellow - Jamaican Asafa Powell held the previous world record of 9.74 seconds . World champion Tyson Gay of United States finished second in 9.85 seconds .
Jamaica 's Usain Bolt sets 100m world record of 9.72 seconds in New York . Fellow-Jamaican Asafa Powell held the previous world record of 9.74 seconds . World champion Tyson Gay of United States finishes second in 9.85 seconds .