Santos clocked 21.81 to break Chad Le Clos’ 2014 Championship Record of 21.95.
Di Liddo’s 56.06 broke Ilaria Bianchi’s 56.13 from 2012.
Melanie Margalis broke the American Record in 2:04.62, winning silver behind Katinka Hosszu.
Caeleb Dressel had the fastest butterfly split in the field at 21.70.
Ryan Murphy will be the lead-off man for the U.S. on the 4×50 medley.
Frenchman Damien Joly broke the France National Record in the men’s 1500 free prelims.
Cameron van der Burgh highlights the men’s 50 breast at day 5 prelims in Hangzhou.
Katinka Hosszu didn’t show for her 100 fly heat shortly after swimming the 200 IM.
Wang Shun didn’t show for his 400 IM heat on day 5.
Andrew Wilson will be the U.S. breaststroker for the 4×50 medley relay prelims.
Freya Anderson won the 200 free in a best time on the opening night of the Ontario Junior International meet in Toronto.
Daiya Seto will start his hunt for a four-peat in the prelims of the men’s 400 IM.
Caeleb Dressel broke the American Record for the third time in 20.43, matching his swim on the mixed free relay.
The American men set another relay world record in the men’s 4×50 free in a time of 1:21.80.
Ariarne Titmus produced the fastest swim of all-time in the women’s 400 free final.