A big day for fans at the Gwangju 2019 World Aquatics Championships on Sunday.
The first world record of the championships was broken by Britain's Adam Peaty in the men's 100-meter breaststroke, beating has own previous world-beating time.
Flirting with a new world record in the heats, Peaty shattered his own record with a time of 56.8-8 seconds during the semifinals of the event.
The final takes place on Monday.
Fans could be in for a treat if the British swimmer wins his third straight world title and sets ANOTHER world record in the process.