The World Athletics Championships are a biennial athletics competition organized by World Athletics. Alongside the Olympic Games, they represent the highest level championships of senior international outdoor athletics competition for track and field athletics globally, including marathon running and race walking. Separate World Championships are held by World Athletics for certain other outdoor events, including cross-country running and half-marathon, as well as indoor and age-group championships.
The Men's 50 metre breaststroke competition of the swimming events at the 2015 World Aquatics Championships was held on 4 August with the heats and the semifinals and 5 August with the final.
The Men's 100 metre breaststroke competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the semifinals and 3 August with the final.
The Men's 100 metre butterfly competition of the swimming events at the 2015 World Aquatics Championships was held on 7 August with the heats and the semifinals and 8 August with the final.
The Women's 50 metre freestyle competition of the swimming events at the 2015 World Aquatics Championships was held on 8 August with the heats and the semifinals and 9 August with the final.
The Women's 400 metre freestyle competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the final.
The Women's 800 metre freestyle competition of the swimming events at the 2015 World Aquatics Championships was held on 7 August with the heats and 8 August with the final.
The Women's 1500 metre freestyle competition of the swimming events at the 2015 World Aquatics Championships was held on 3 August with the heats and 4 August with the final.
The Women's 50 metre butterfly competition of the swimming events at the 2015 World Aquatics Championships was held on 7 August with the heats and the semifinals and 8 August with the final.
The Women's 100 metre butterfly competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the semifinals and 3 August with the final.
The Women's 200 metre individual medley competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the semifinals and 3 August with the final.
The Women's 4 × 100 metre freestyle relay competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the final.
The 4 × 100 metre mixed freestyle relay competition of the swimming events at the 2015 World Aquatics Championships was held on 8 August with the heats and the final.
The 4 × 100 metre mixed medley relay competition of the swimming events at the 2015 World Aquatics Championships was held on 5 August with the heats and the final.
The Men's 50 metre breaststroke competition at the 2017 World Championships was held on 25 and 26 July 2017.
The Women's 50 metre freestyle competition at the 2017 World Championships was held on 29 and 30 July 2017.
The Men's 50 metre freestyle competition at the 2019 World Championships was held on 26 and 27 July 2019. Caeleb Dressel finished first in the final, retaining the title he won in the previous Championships.
The Men's 100 metre breaststroke competition at the 2019 World Championships was held on 21 and 22 July 2019. Adam Peaty broke the world record with a time of 56.88 in the semi-final, the first man to swim under 57 seconds in this event, and went on to win in the final.
The Men's 50 metre butterfly competition at the 2019 World Championships was held on 21 and 22 July 2019. The defending champion Ben Proud finished 7th in the final. The winner, Caeleb Dressel, set a competition record in the final, winning in 22.35 seconds.
The Men's 100 metre butterfly competition at the 2019 World Championships was held on 26 and 27 July 2019. The defending champion Caeleb Dressel broke Michael Phelps' ten-year-old record by 0.32 second in the semi-final, setting a new world-record time of 49.50 seconds. Dressel won the final held the following day, defending his title.
