The men's 100 metre butterfly event at the 2009 World Aquatics Championships took place between 31 July – 1 August at the Foro Italico. Both the heats and semifinals were held on 31 July with the heats being held in the morning session and the semifinals being held in the evening session. The final was held on 1 August.
The Men's 50 metre breaststroke competition of the swimming events at the 2015 World Aquatics Championships was held with the heats and the semifinals on 4 August 2015 and the final on 5 August 2015.
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 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 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 Men's 50 metre breaststroke competition at the 2017 World Championships was held on 25 and 26 July 2017.
The Men's 100 metre breaststroke competition at the 2017 World Championships was held on 23 and 24 July 2017.
The Women's 50 metre freestyle competition at the 2017 World Championships was held on 29 and 30 July 2017.
The Women's 100 metre breaststroke competition at the 2017 World Championships was held on 24 and 25 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 200 metre butterfly competition at the 2019 World Championships was held on 23 and 24 July 2019. The event was won by Kristóf Milák, who broke a 10-year-old record set by Michael Phelps, and set a new world-record time of 1:50.73 in the process.
The Women's 200 metre backstroke competition at the 2019 World Championships was held on 26 and 27 July 2019.
The Women's 4 × 100 metre freestyle relay competition at the 2019 World Championships was held on 21 July 2019.
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