Britain's Alan Campbell clinched a superb victory over world champion Mahe Drysdale in the final of the Diamond Sculls at Henley Royal Regatta.
Alan Campbell beat world champion Mahe Drysdale at Henley
The 24-year-old had never previously beaten New Zealand's Drysdale in international competition.
Campbell, from Coleraine, led from the start to win by a length and a quarter in eight minutes four seconds.
"That was the toughest race I have ever been involved in. I had to dig really deep," said Campbell.
"It is a great feeling to know I have beaten a double world champion, the world record-holder and my best friend.
"There are higher expectations now - not just from the crowd. I expect higher standards from myself."
The British coxless four of Steve Williams, Peter Reed, Andrew Triggs-Hodge and Tom James - in for the injured Alex Partridge - extended their two-year unbeaten run with victory in the final of the Stewards' Challenge Cup.
The quartet - racing as Leander and Molesey - beat Brentwood College Rowing Club and Shawnigan Lake School from Canada by two-and-a-quarter lengths in a time of seven minutes 14 seconds.
In the final of the Remenham Challenge Cup, the German national eight - rowing for Dortmund Rowing Club - beat the British eight, in the colours of Thames RC and Leander, by a length-and-a-half.
There was disappointment for Britain's Jennifer Goldsack, who was beaten in the final of the Princess Royal Challenge Cup single sculls event by the USA's Michelle Guerette.