Overview
- Marchand overcame a 4:13.19 qualifying time to post a 4:04.73 in the 400m individual medley final, winning by more than three seconds.
- He finished 3.59 seconds ahead of silver medallist Tomoyuki Matsushita (4:08.32) and 4.43 seconds ahead of bronze medallist Ilia Borodin (4:09.16).
- Less than 30 minutes after his individual victory, Marchand swam the breaststroke leg to help France claim silver in the 4×100m medley relay in 3:27.96.
- Earlier in the week he set a world record of 1:52.69 en route to his 200m medley title, marking his second gold of the championships and the seventh world title of his career.
- France closed the championships third in the medal table with eight medals—four golds, one silver and three bronzes—its strongest European performance since 2013.