Katinka Hosszu ha conquistato il titolo iridato dei 400m misti nella prima giornata dei Campionati del Mondo in vasca corta di Hangzhou, diventando di conseguenza la donna più titolata e più medagliata della storia della rassegna iridata in piscine da 25m. Il totale dell'ungherese è infatti salito a 14 ori e un totale di 23 podi. La "Dama di ferro", così soprannominata per la sua capacità di inanellare le corse con brevi tempi di recupero, si è imposta in 4'21"40.
In Cina sono caduti pure i primi due record planetari. Il giapponese Dalya Seto ha abbassato di 32 centesimi il primato sui 200m farfalla, portandolo a 1'48"24 e mettendosi al contempo al collo la medaglia d'oro. La squadra USA ha invece fatto registrare il nuovo miglior tempo nella 4x100 stile libero in 3'03''03, ovvero 27'' in meno rispetto al precedente primato.
In campo rossocrociato nessuno è riuscito a qualificarsi per le semifinali, ma sono comunque arrivati due primati nazionali. Lisa Mamié ha migliorato il record dei 50m rana fermando il cronometro in 31"04, mentre sulla distanza doppia (stesso stile) Yannick Käser ha chiuso in 58"61.
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