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Swimming Day 3 roundup: Ledecky and Titmus clash in 400 free, Dressel leads Team USA

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Action returns to the Tokyo Aquatics Center on Day 3 for the second batch of swimming finals. Medals are on the line in four events: the women's 100m butterfly, men's 100m breaststroke, women's 400m freestyle and men's 4x100m freestyle relay.

A matchup between Katie Ledecky and Ariarne Titmus in the 400 free headlines the session, with the dominant Adam Peaty competing in his signature 100 breast and Caeleb Dressel getting his Tokyo Games started on the U.S. relay also adding to the night's intreague.

Watch live on NBC in primetime, or stream the action on NBCOlympics.com and on the NBC Sports app.

SEE MORE: Day 3 swimming preview: Katie Ledecky, Caeleb Dressel eye first Tokyo medals

Women's 100m Butterfly - Final

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In an absolute nail-biter, the top four swimmers finished within 0.14 seconds of each other as gold, silver and bronze were all decided right at the touch. 55.59 ended up as the gold medal-winning time.

Canada's Maggie MacNeil got her fingertips on the wall first, while China's Zhang Yufei just .05 behind for silver. 

Australia's Emma McKeon got in one one-hundredth ahead of American Torri Huske to round out the podium.

SEE MORE: Women's 100m butterfly down to the wire for all 3 medals

Men's 200m freestyle - Semifinals

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All three top seeded swimmers emerged from the second semifinal as Great Britain's Scott Duncan, American Kieran Smith and Danas Rapsys of Lithuania went 1-2-3.

Duncan set the pace at 1:44.60 headed into the final.

Women's 100m Breaststroke - semifinal

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In a semifinal upset, Lilly King failed to win a heat in major competition for the first time in six years. South Africa's Tatjana Schoenmaker touched first in the second semifinal in 1:05.07 and will be the top seeded swimmer in Monday's final.

King said she had plenty more "left in the tank" for the final, and was undeterred after getting beat.

In the first semifinal, Lydia Jacoby, the other American, beat out her competitors, including Russian athlete Yulia Efimova.

SEE MORE: Schoenmaker hands Lilly King rare loss in 100 breast semi

Men's 100m breaststroke - final

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Adam Peaty's grip on this event remains. The world record holder and defending Olympic champion took gold in 57.37.

Arno Kamminga and Nicolo Martinenghi rounded out the podium, with the American Michael Andrew fourth.

SEE MORE: Adam Peaty defends 100m breaststroke gold medal

Women's 400m freestyle - final

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SEE MORE: Australia’s Ariarne Titmus dethrones Katie Ledecky in thrilling 400m free final

Men's 100m backstroke - semifinal

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Women's 100m backstroke - semifinal

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Men's 4x100m freestyle relay - final

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A tremendous swim from all four Americans Caeleb Dressel, Blake Pieroni, Bowe Becker and Zach Apple clinched gold in 3:08.97 ahead of Italy and Australia.

Apple's anchor leg was best of them all at 46.69, with Dressel's leadoff leg at 47.26 to give the United States the early lead. 

The final exchange between Becker and Apple nearly disqualified the U.S., had apple left his blocks .05 seconds later.

For Dressel, the relay is his first of a potential seven gold medals in Tokyo.

SEE MORE: U.S. takes 4x100m free relay for Dressel's first Tokyo gold