Four events will crown medalists today and plenty of Americans are in the hunt for hardware.
Ryan Murphy is in contention for another medal at this year's Olympics, this time in the 200m back. Caeleb Dressel also returns to the pool for the men's 100m butterfly one night after winning gold in the 100m freestyle.
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American duo Annie Lazor and Lilly King are both fighting for the top step of the podium in the women's 200m breaststroke, but they'll have to get past Olympic record holder Tatjana Schoenmaker to get there.
Follow along below as the action unfolds.
Watch the action LIVE in primetime on NBC beginning at 9:30 p.m. ET and stream the entire session LIVE on NBCOlympics.com and the NBC Sports app.
Men's 100m Butterfly, Semifinals
Caeleb Dressel became the first man to break 50 seconds in the 100m butterfly at the Olympic Games Friday, winning the event's second semifinal in 49.71.
It's the third-fastest time in history. Only Dressel himself has gone quicker. His world record, set at the 2019 World Championships, stands at 49.50.
Hungary's Kristof Milak, the 200m butterfly gold medalist, raced in the first semifinal and went, 50.31. For a matter of minutes, that time stood as an Olympic record.
Milak is considered the only swimmer with a chance at potentially spoiling things for Dressel, the heavy favorite.
SEE MORE: Caeleb Dressel goes sub-50 in 100 fly for Olympic record
Women's 200m Breaststroke, Final
South Africa's Tatjana Schoenmaker captured the first individual swimming world record of the Tokyo Olympics, breaking the eight-year-old mark of 2:19.11 in Friday's final to win the gold medal.
Her time of 2:18.95 unseats Denmark's Rikke Moller Pedersen, who held the record since the 2013 World Championships.
Both American swimmers in the event, Lilly King and Annie Lazor, rounded out he podium.
Men's 200m Backstroke, Final
American Ryan Murphy won another Olympic medal, a silver, as gold went to Russian athlete Evgeniy Rylov.
Rylov is now a two-time gold medalist in Tokyo, after also winning the 100m backstroke.
He finished in 1:53.27, nearly a second ahead of Murphy.
Great Britain's Luke Greenbank took the bronze as American Bryce Mefford finished just outside the podium places in fourth.
Women's 100m Freestyle, Final
Australian Emma McKeon lowered the Olympic record to 51.96 in a gold medal-winning effort, ahead of Hong Kong's Siobhan Haughey and fellow Aussie Cate Campbell.
Canada's Penny Oleksiak, co-champion at the Rio 2016 Olympics with Simone Manuel, finished outside the medals in fourth.
Manuel did not qualify for the event. The lone American in the final, Abbey Weitzeil, finished eighth in 53.23.
SEE MORE: McKeon leads end-to-end, sets new Olympic record in 100 free
Men's 200m IM, Final
As expected, American Michael Andrew was in the lead by more than a second after 150 meters. Could he hold on in the freestyle, his weakest stroke?
Not quite. Not even for a medal.
Andrew finished fifth as China's Wang Shun took gold in 1:55 flat.
Great Britain's Duncan Scott and Swiss swimmer Jeremy Desplanches rounded out the podium, with Japan's Seto Daiya, one of the favorites coming into his home Olympics, touched fourth.
Women's 200m Backstroke, Semifinals
Australian Kaylee McKeown entered as one of the big favorites to win gold. She backed that up with the quickest time in prelims.
She's joined by Canadian Kylie Masse in Semifinal 2. Americans Rhyan White and Phoebe Bacon headline Semifinal 1 after posting two of the hottest times from the first round of heats.