Carson Foster Looking Strong for Rebound Summer in 2026
For the last half-decade, Carson Foster has been the clear No. 1 performer in the United States in the 400 individual medley. After narrowly missing the Tokyo Olympic team in the event, Foster produced a time that would have been quick enough for Olympic gold later that summer. Less than a year later, he made his senior-level international debut at the 2022 World Championships.
Foster’s run has coincided with that of Leon Marchand, and no one has come close to stopping the Frenchman in his run toward swimming immortality. Still, Foster has been as successful as any non-Marchand performers during that span. Between 2022 and 2024, he won four World Championships silver medals in the medley events, and he became an established forced on a resurgent American squad in the 800 freestyle relay.
In his Olympic debut in Paris, Foster won bronze in the 400 IM, missing out on silver by just four hundredths. Foster almost captured another medal in the 200 IM, finishing just a tenth short, and he was one of just five American men to win an individual medal at those Games.
The next year, however, brought setbacks. While much of the American team at the Singapore World Championships battled a gastrointestinal illness, Foster was dealing with an ankle injury. After a solid fifth-place finish in the 200 butterfly, Foster was forced to withdraw from the 200 IM final and then skip the 800 free relay and 400 IM entirely. His usual form would have put him well within the medal conversation in his signature event.
Since then, however, things have been pointing in a positive direction for the 24-year-old, a Cincinnati native who has been based at the University of Texas since 2020. During the fall season, he swam a 400 IM time of 4:07.02, his best in more than two years and within a half-second of his lifetime best. Already in 2026, Foster went 4:09.49 in the event at the Westmont stop of the Pro Swim Series in March, and he followed that up with a strong performance at last week’s Fort Lauderdale Open.
Racing against Marchand, now his training partner under Bob Bowman’s watch, Foster put forth a blistering freestyle split of 58.62 to come within a second of the Frenchman, Marchand at 4:09.33 and Foster 4:10.24. While finishing speed was once Foster’s weakness in the event, he now surpasses any of his rivals on that stroke.
At the same meet, Foster swam a time of 1:55.09 for second place behind Marchand in the 200 fly, his mark good for eighth in the early world rankings, and he finished in 1:57.95 in the 200 IM, tying with fellow Longhorn Hubert Kos for a runnerup finish to Marchand. With a season-best of 1:57.39 from March, Foster currently ranks fourth-best in the world.
Those results put Foster in position for a strong summer season to come. Already qualified for the Pan Pacific Championships, Foster is expected to race those events plus perhaps additional ones if the schedule allows. The 400 free is one event that could come into play after Foster clocked 3:45.73 in the event in December, allowing him to finish the year as the fifth-quickest American in the event.
The 400 IM remains his signature event, however, and a showdown between Foster and Japan’s Tomoyuki Matsushita, the Olympic silver medalist, should be among the top contests at Pan Pacs. Matsushita swam a time of 4:06.93 in March to become the ninth-fastest performer in history, but Foster still owns a quicker all-time best, having clocked identical marks of 4:06.56 in the Worlds finals in 2022 and 2023. His strong form thus far indicates he could return to that speed or go even quicker this year.