Ihar Boki set a world record as the World Para Swimming World Series finale began in Berlin, Germany.
The Belarusian, a multiple Paralympic champion, only took silver in the 200 metres freestyle final but set a world record in his S13 category in a time of 1min 50.34sec.
S4 swimmer Ami Omer Dadaon of Israel collected 981 points to claim the gold medal with Briton Reece Dunn taking bronze as he swam an S14 world record in 1:53.57.
There was also a world record for British team mate Brock Whiston in the women's 100m breaststroke.
Despite having to settle for silver behind Germany's Elena Krawzow, Whiston still had a sterling day in the pool.
In her morning heats she set a world record of 1:15.36, before going even faster to clock an SB8 category record of 1.14.51 in the final.
Krawzow's haul of 1,139 points sealed the gold, with Whiston second on 1,115 points.
Russian Andrei Kalina won gold in the men's 100m breaststroke ahead of Spanish duo Oscar Salguero Galisteo and Antoni Ponce Bertran.
There was further success for the Russian team as they recorded a one-two finish in the men's 100m backstroke final.
Roman Makarov topped the podium with 858 points as team mate Kirill Belousov claimed silver on 843 points.
Britain's S8 swimmer Alice Tai made a winning start as she collected 962 points and the gold medal in the women's 100m butterfly.
Her team mate Toni Shaw took silver ahead of Russian Daria Pikalova.
Tai had to settle for silver in the women's 200m butterfly as Canada's Aurelie Rivard claimed the top step of the podium.