The world's most famous athlete Usain Bolt breezed through his 100m preliminary round to win his heat with a time of 10.09 despite concerns over his fitness.
His fellow countrymen Yohan Blake and Asafa Powell also won their respective heats, with Blake recording a flat ten seconds time.
But the Jamaicans weren't the only ones in good shape.
Team USA's Tyson Gay - known as the second fastest man in the world - took victory in the first race and Gay's compatriot Justin Gatlin ran a sub-10 9.97 seconds.
Team GB put in a good show with youngster and crowd favourite Adam Gemili qualifying in second and Dwain Chambers, now 34 years old, put a season's best performance of 10.02.