22-year-old swimmer Carson Foster made up for missing out on Tokyo 2020 by booking his ticket to Paris after winning the 400m individual medley ahead of two-time Olympic medallist (silver at Rio 2016 and gold at Tokyo 2020) Chase Kalisz on the second day of the finals at the United States Trials.

Foster, from Cincinnati and a swimmer at the University of Texas, led the entire race to finish in 4m7.64s at the spectacular Lucas Oil Stadium, home of the NFL's Indianapolis Colts and with an impressive capacity of up to 32,000 fans per session (twice the size of La Défense Arena, where the swimming events will be held in Paris from 27 July).

From 15-23 June, Indianapolis is host the United States Trials, which will decide the places for the Paris 2024 Olympic Games, with 1007 swimmers in action.

Foster's commanding victory saw Kalisz close the gap in the breaststroke and freestyle legs to finish second in 4:09.39, but he never threatened Foster's lead.

It was an emotional triumph for Foster, who led for 350 metres in the Tokyo qualifiers only to be overtaken by Jay Litherland, who secured the second Olympic berth and won silver behind Kalisz in Tokyo. This time Litherland finished third and missed out.

In Paris, the Americans will be looking to challenge French world record holder Leon Marchand, who will be looking to shine on his home turf.

Veteran Nic Fink, 30, secured his Olympic spot by winning the men's 100m breaststroke in 59.08 seconds, with Charlie Swanson second in 59.16.

In the semi-finals, world record holder and Rio 2016 gold medallist Lilly King led the women's 100m breaststroke time in 1:05.67, the only sub-66 second time.

"It felt like I was stepping into a boxing match," said the Indiana-born King, who will face the likes of Tokyo gold medallist Lydia Jacoby in Monday's final.

Freestyle star Katie Ledecky, on her way to a fourth Olympics after winning the 400m freestyle, topped the times in the 200m freestyle semi-final in 1:55.25.

There was drama in the men's 100m backstroke semi-final as top seed Hunter Armstrong slipped at the start and finished last, but recovered to finish second in his heat and book his place in the final.

Ryan Murphy, who won double gold in the backstroke at Rio 2016, led the way into the final with a time of 52.65 seconds.