Usain Bolt broke his own world record as he raced to gold in the 100 metres in Beijing.
The Jamaican runner was well clear of the other runners by 60m, so he started celebrating before he'd even crossed the finish line!
But he still finished in 9.69 seconds, beating his previous best set in May.
Richard Thompson of Trinidad and Tobago won the silver, and America's Walter Dix the bronze.
But they were yards behind the 21-year-old nicknamed the Lightening Bolt.