The silver medals from the 2007 Osaka World Championships boosted Bolt's desire to sprint, and he took a more serious, more mature stance towards his career. Bolt continued to develop in the 100 m, and he decided to compete in the event at the Jamaica Invitational in Kingston. On 3 May 2008, Bolt ran a time of 9.76 s, with a 1.8 m/s tail wind, improving his personal best from 10.03 s. This was the second-fastest legal performance in the history of the event, second only to compatriot Asafa Powell's 9.74 s record set the previous year in Rieti, Italy. Rival Tyson Gay lauded the performance, especially praising Bolt's form and technique. Michael Johnson observed the race and said that he was shocked at how quickly Bolt had improved over the 100 m distance. The Jamaican surprised even himself with the time, but coach Glen Mills remained confident that there was more to come.