100m performance guesstimates from the Juno Awards red carpet

Host Simu Liu made a surprisingly bold assertion

WATCH: 18-year-old U.S. sprint star becomes fourth fastest man over 200m

Erriyon Knighton, who brokeĀ Usain Bolt’sĀ junior sprint records at 17, shattered his U20 200m world record in 19.49 seconds

Justin Gatlin announces his retirement

Gatlin will be hanging up his spikes after a 19-year career that included an Olympic gold medal, multiple World Championship titles and several doping bans