Overview

• Katie Ledecky won her seventh 800m freestyle world title in 8:05.62, extending her unbeaten streak in major finals.
• Léon Marchand captured the men’s 400m individual medley in a championship record of 4:04.73 for his second gold of the meet.
• U.S. teams set world records in the mixed 4×100m freestyle (3:18.48) and women’s 4×100m medley relay (3:49.34), vaulting them to the top of the medal table.
• Michael Phelps and Ryan Lochte publicly questioned USA Swimming’s direction following earlier relay disappointments.
• Twelve-year-old Yu Zidi’s performance in the 400m individual medley prompted World Aquatics to review its minimum age eligibility rules.