Chase Tyler Kalisz (/ˈkeɪlɪʃ/ KAY-lish; born March 7, 1994)[1] is an American swimmer who specializes in individual medley events.

[3] In August, at the 2012 Junior Pan Pacific Swimming Championships conducted at the Veterans Memorial Aquatic Center in Honolulu, Hawaii, Kalisz was the Junior Pan Pacific champion in both the 200 meter individual medley, where he won the gold medal with a Championships record of 1:59.51, and the 400 meter individual medley, where he won the gold medal in a Championships record time of 4:12.59, as well as a silver medalist in the 4×200 meter freestyle relay with a final relay time of 7:19.89.

[3][9] At the 2013 World Aquatics Championships in Barcelona, Spain, Kalisz won the silver medal in the 400 meter individual medley, finishing with a time of 4:09.22, dropping over two full seconds off his previous best time, and touching the wall less than six tenths of a second behind the gold medal winner, Daiya Seto of Japan.

[11] In November, Kalisz won USA Swimming's Golden Goggle Award for "Breakout Performer of the Year" for his accomplishments at the international and national levels in 2013.

[14][15][16] The pool record he set for the Lee and Joe Jamail Texas Swimming Center stood through the duration of the 2019 NCAA Championships where the fastest swimmer was almost two full seconds off Kalisz's mark.

[17] In his junior year of collegiate swimming for the Georgia Bulldogs, Kalisz placed second in the 400-yard individual medley, behind Texas Longhorns' Will Licon, finishing well off his best time in 3:39.51.

[19] At the 2015 FINA World Championships, Kalisz earned a bronze medal behind Daiya Seto of Japan and Dávid Verrasztó of Hungary in a time of 4:10.05.

[21] Kalisz competed in the 400 meter individual medley at the 2016 Olympic Games in Rio de Janeiro, Brazil in August.

[16][37][38] He became the sixth swimmer in NCAA history to win the title in the men's 400 yard individual medley three or more times, with the previous person, Tim Siciliano, achieving the feat in 2001.

[39][40] He also finished third in the 200 meter butterfly with a time of 1:54.79, missing the World Championship team in that event by less than three tenths of a second.

[46][47] Looking forward to the chance to win an Olympic gold medal in the 400-meter individual medley after winning a silver medal in the event at the 2016 Olympic Games, Kalisz expressed he was grateful for the extra training time the COVID-19 pandemic provided, saying, "I don't want to say I wasn't prepared last year, because I was.

[50] At the 2020 Summer Olympics in Tokyo, Kalisz won gold in the 400-meter individual medley with a time of 4:09.42 on day two of competition.

[57] The occurrence of his winning the gold medal combined with American teammate Jay Litherland winning the silver medal in the 400 meter individual medley marked an improvement in the performance of the duo of Americans entered in the event over the previous two Olympic Games where the next best performance from two Americans was Ryan Lochte winning the gold medal and Michael Phelps finishing in fourth place at the 2012 Olympics.

[61][62] On the fifth day of competition, Kalisz ranked fourth overall with a time of 1:57.38 in the prelims heats of the 200-meter individual medley and qualified for the semifinals.

[74] Starting off the 2022 US International Team Trials in Greensboro, North Carolina, on day one, Kalisz advanced to the final of the 200 meter butterfly with a time of 1:56.04 and overall rank of third in the prelims heats.

[81] At the 2022 World Aquatics Championships, Kalisz ranked third in the preliminary heats of the 400 meter individual medley on day one of swimming competition with a 4:10.32, advancing to the final behind first-ranked Léon Marchand and second-ranked Carson Foster.

[83] Three days later, he ranked second in the morning preliminaries of the 200 meter individual medley with a time of 1:58.25 and qualifying for the semifinals.

[85] He placed fourth in the final with a time of 1:56.43, finishing 0.21 seconds behind bronze medalist Daiya Seto of Japan.

[87] Day two of the 2022 U.S. Open Swimming Championships, held in Greensboro in November and December, Kalisz won the gold medal in the 200 meter individual medley with a Championships record time of 1:56.52, which was 2.62 seconds ahead of silver medalist Baylor Nelson and 3.37 seconds ahead of bronze medalist Daniel Diehl.