Una stratosferica Ledecky ha letteralmente dominato gli 800m stile libero firmando il nuovo record mondiale di 8'07"39. La statunitense ha stravinto con dieci secondi di margine sulla neozelandese Boyle (8'17"65) e undici sulla britannica Carlin (8'18"15). Per la diciottenne si tratta del quinto oro ai Mondiali di Kazan e il nono della carriera.
A far cadere un altro primato del mondo ci hanno pensato gli USA che nella 4x100 mista hanno vinto la finale in 3'23"05. Alle loro spalle sono giunti gli olandesi (3'23"10) e i canadesi (3'23"59).
La finale più attesa, i 50m stile libero, è stata conquistata dal transalpino Manaudou (21"19) che si è imposto sullo statunitense Adrian (21"19) e il brasiliano Fratus (21"55).
Nei 50m delfino Sjöström si è messa al collo l'oro aggiudicandosi la finale in 24"96 davanti la danese Ottesen (25"34) e la cinese Lu (25"37).
Nei 100m delfino, Le Clos ha strappato la vittoria a Cseh. Il sudafricano ha regolato l'ungherese per soli 0"31 terminando in 50"56. L'atleta di Singapore Schooling (50"96) si è invece preso il bronzo.
Grazie ad una rimonta impressionante nell'ultima vasca, l'australiana Seebohm ha vinto i 200m dorso registrando il record dell'Oceania di 2'05"81. La statunitense Franklin (2'06"43) e l'ungherese Hosszu (2'06"84) hanno chiuso il podio.
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