Belarusian Ihar Boki (23.21) began his European Championships campaign in style with a new world record in the men's 50m freestyle S13 on his first outing at the Pieter van den Hoogenband Swimming Stadium in Eindhoven, the Netherlands, on Thursday (7 August).
The beaming London 2012 silver medallist, who failed to make it through the heats in the event last year at the World Championships, was delighted with his first European gold in the event.
"I am very happy for my win on this distance," he said. "It is not my distance but I worked hard with my coach.
"I am very happy. It's a good time."
Ukraine's Iaroslav Denysenko (24.00) was just 0.79 seconds behind and lead Russian Aleksandr Golintovskii (24.55) onto the podium.
Boki next heads out in the men's 100m freestyle S13 on Saturday (9 August), looking to add the European title to his Paralympic and Worlds gold.
Norway's world and Paralympic champion Sarah-Louise Rung (3:25.37) picked up her third gold in the women's 200m individual medley SM5, overtaking Spanish rival Teresa Perales (3:42.23) at the halfway point to seal victory.
Rung, however, was disappointed with her comparatively slow time.
"It was a terrible race. Just before the race, I had a pain in my hip so the start of the 50m fly was just depressing. That made the whole race a disaster from start to end.
"It is ten seconds behind my PB. Really I should be chasing the world record."
Ukrainian Natalia Shestopal (3:53.05) completed the podium with her first medal of the Championships.
Great Britain's Andrew Mullen (3:06.78) sealed his second gold in less than 24 hours in the men's 200m individual medley SM5, as the silver and bronze medal finishers raced all the way to the wall.
"I'm really happy to have two golds," the 17-year-old said. "To go from no international medals in three years to two golds in less than 24 hours, I'm really happy."
Greek Antonios Tsapatakis (3:19.28) just edged Russia's Roman Zhdanov (3:19.42) to take silver.