The 22-year-old secured victory in 56.68sec to become the most decorated Rio 2016 Paralympian with seven medals overall, having also collected a bronze in the men’s 100m breaststroke SB13.

"There is a feeling of lightness because I did so much work to achieve this," Boki said.

"I’m happy that I was able to have decent results in this competition, and that I was able to stay strong.

"All of these 10 days were very difficult and I had to swim a race almost every day.

"I wanted to go out and just show the results that I am capable of right now.

"I came out here and I showed that and apparently that was enough to get the gold medals."

Boki now has 11 Paralympic titles from two Games, improving on his London 2012 performance where he took home five golds and a silver.

Ukraine’s Iaroslav Denysenko was second in the race as he had been at the 2015 International Paralympic Committee (IPC) Swimming World Championships.

His time of 59.02 was narrowly quicker than that of Canada’s Nicolas Turbide, who claimed bronze in 59.55 to lower the Americas record.

Brazil’s Daniel Dias won his fourth gold medal of Rio 2016 as the man who inspired him to take up swimming, compatriot Clodoaldo Silva, retired from international competition.

Dias controlled the men’s 100m freestyle S5 race from the start, touching in 1:10.11 for victory as the United States' Roy Perkins and Great Britain's Andrew Mullen came second and third in 1:14.55 and 1:15.93 respectively.

Six-time Paralympic champion Silva, who finished eighth in the race, had a long and emotional embrace with Dias at the side of the pool in the aftermath. 

A further two world records were broken this evening, bringing the overall count to more than 60 over the 10 days of competition.

Britain made their contribution once again courtesy of Oliver Hynd, who lowered the global mark in the men’s 200m individual medley SM8 en route to defending his title.

Hynd clocked a time of 2:20.01 to better the mark set by Australia’s Peter Leek at the Beijing 2008 Paralympic Games, and win his second gold medal at Rio 2016.

China’s Song Maodong relinquished his early lead to finish second in an Asian record time of 2:02.79, while compatriot Xu Haijiao was third in 2:21.19.

World champion Yelyzaveta Mereshko of Ukraine won her fourth gold with a world record-breaking time of 1:11.40 in the women’s 100m freestyle S6.

The 24-year-old led from the front to claim victory ahead of team-mate Viktoriia Savtsova, second in 1:13.47, and Britain’s Ellie Robinson, third in 1:14.43.

Rio 2016 Paralympic swimming action concluded with the men’s 4x100m medley relay 34 points as China posted a time of 4:06.44 to break the Paralympic record and win gold. 

Ukraine finished runners-up in 4:07.89, while the biggest cheer of the night came for Brazil’s bronze in an Americas record time of 4:17.51.

China finished first in the swimming medal table with 37 golds, 30 silvers and 25 bronzes.

For a full set of today's results, check out our live blog here.