Helen Glover and Polly Swann got Great Britain off to a golden start on finals day of the World Rowing Cup in Lucerne, Switzerland.
Their victory, in the morning session, in the women's pair came in the face of strong opposition from New Zealand and the USA.
The duo, coached by Robin Williams, led from the outset but had to put their foot down in the final few hundred metres to stave off a push from the Kiwis. Their gold today brought up the hat-trick at this season's world cup, having also won at Eton Dorney last month and Sydney in March.
Afterwards Glover, the Olympic champion with Heather Stanning said: "When I looked at 2013 I thought I wouldn't win a gold. Every race we have entered we have gone with a 'must learn' rather than 'must win' attitude".
Swann was already looking forward to the World Championships in Korea next month. "It was good to win today and now we need to build for Korea".
Britain were rowed out of a bronze by New Zealand in the final two strokes of the lightweight women's double scull final.
Kathryn Twyman and Imogen Walsh recovered from a slow start to be in touching distance of the podium at the finish, the Antipodeans getting the verdict by just nine-hundredths of a second.
"We put in a really good middle part of the race today and we've improved with every race out here', said Walsh.
"Neither of us had any idea who had won the medal", said Twyman afterwards. "That two minute wait was the longest ever until the result came up". The result today was enough to keep them as overall world cup winners in this boat class.
Earlier the lightweight men's four were fifth in a final won by New Zealand. The GB combination had held bronze medal position until 1500m gone when the Netherlands and, on the line, the Olympic Champions, South Africa, came through the British boat.
This morning's results came after a gold for the lightweight men's pair yesterday of Mark Aldred and Sam Scrimgeour.
Today's afternoon session includes seven more British finalists, culminating in the men's eight final.
The event is being televised in the UK by BBC TV Sport - live on the website and then on the Red Button on Suunday 14th and a highlights programme on Monday 15 from 15.00 on BBC 2.
RACE REPORTS
Sitting on the start line Olympic champion Cornwall's Helen Glover and Scotland's Polly Swann wore the luminous yellow of the world cup leaders. Today, though, was going to be their toughest test yet in 2013 with top opposition from New Zealand's Rebecca Scown and Kayla Pratt as well the USA.
Glover and Swann were over a second up on the Netherlands as the first quarter of the race was completed. The USA moved up to second at the halfway. Past the boating enclosures and cheered on by team-mates and family, the British duo were still in the lead but New Zealand had now moved to the top of the chasing peloton.
GB still held almost a length over New Zealand as the crews came past the grandstands. Did Glover and Swann have enough left? It was going to be close but the British crew gritted their teeth picked up the pace and completed their hat-trick of world cup golds this season by just over a second from New Zealand.
"It was good for us to have to row away from people at the end", said Glover afterwards. "We have come to each race this year not with the 'must win' attitude but with the 'must learn' attitude".
Swann added: "With this kind of opposition you can never be complacent".
Kathryn Twyman, from Oxford, and Imogen Walsh, from Inverness, were the overall world cup leaders going into today's final of the Lucerne World Cup - one in which the field had much better depth than previously including a top-rated Italian double.
It was the USA, though, who set the early pace to lead Germany by three-quarters of a length at 650m gone but with Italy coming up fast. The GB boat had kept themselves in medal contention at halfway, coming up into third place.
At 1500m gone, Italy went through the USA to lead and the GB boat was coming back into contention in third place on the near-side but with a really strong final challenge on their inside from New Zealand.
It went down to the final stoke which proved heart-break for the GB crew who were just rowed out of the medals by New Zealand. The margin between the two was just nine hundredths.
Welshman Chris Bartley, Jonno Clegg of Maidenhead, Will Fletcher, from County Durham and Windsor's Adam Freeman-Paksk were third at the 500m marker of the lightweight men's four final today. New Zealand, the overall world cup leaders, and Denmark were the early pace-makers with the former building a considerable lead from the outset. By halfway the GB boat was still in contention with Denmark but the gap had begun to widen.
Behind them the battle for bronze sharpened as the Dutch overhauled the British with just the final quarter of the race to go. New Zealand looked to have the victory sewn up and the British quartet battled stroke by stroke on the final push to the line.
In a tight finish the Netherlands took bronze and the Olympic champions, South Africa, pipped the GB combination to fourth by just five hundredths of a second.
B FINALS
The women's quadruple scull of Lucinda Gooderham, Monica Relph, Rosamund Bradbury and stroke Kristina Stiller were fourth in today's B final having held third place until the 500m marker. GB's new combination in this boat category looked to be closing on third-placed Canada at the finish in a race won by the Netherlands with New Zealand in second.
Alan Sinclair, Nathaniel Reilly O'Donnell, Scott Durant and Mat Tarrant were third in the B final of the men's four. They have struggled to find their form here somewhat after some tough racing and good performances at Eton Dorney and Henley.
Victoria Thornley was in second place at the 1500m marker in her B final of the women's single scull. Agonisingly, in the final 10 strokes, she slipped back to fourth as Germany's Lisa Schmidla and the second Dutch sculler Chantal Achterberg found a touch more finishing speed than the clearly tiring Thornley.
Italy and Great Britain 2 lined up to race a two-boat B final this morning. The second GB men's eight here has been drinking up the experience of racing on the world-famous Rotsee amongst some of the greats of the sport. As a development crew from a number of clubs, they are learning their trade. Some, no doubt, will emerge to take slots in the squad as the Olympiad progresses.
Today they trailed the Italian opposition by some margin early in the race before a long sprint to the line brought the British crew into contention before Italy picked up the rate and found enough pace to get the win by half a second.