Jamaica`s Usain Bolt set the 100m World record in New York, clocking 9.72sec at the Reebok Grand Prix Athletics Meeting. Bolt, 21, yesterday lowered the record of 9.74sec set by compatriot Asafa Powell at Rieti, Italy, last September. Bolt, the 200m World championships silver medallist, had signalled his arrival on the 100m scene in this Olympic year in early May, when he clocked 9.76 - then the second-fastest time in history - at a meeting in Jamaica. Bolt had already set the athletics world buzzing on May 3, when he clocked 9.76 - second fastest in history - at a meeting in Kingston.