The new world record time is 23.71 and was set in Grennsboro in North Carolina.
- I can not find words, says the 21-year-old after the race, which means that he also secured the only American World Cup ticket in the distance.
The previous world record was set by Russian Kliment Kolesnikov at the European Championships in Budapest in May 2021 at 23.80.
Armstrong was part of the American medley team that took gold in the Tokyo Olympics last year in the 4x100 meters.
Individually, it was a ninth place in the 100 meter backstroke.
MORE SWIMMING: New world year best by Sjöström in Swim Open (11/4)
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New world year best by Sjöström in Swim Open