Ayton and Clark had to deal with light winds in Kiel
Sarah Ayton and Saskia Clark boosted in their London 2012 preparations with their first major win since teaming up at the start of the year.
They dominated in the 470 class in the ISAF World Cup regatta in Kiel.
British 49er duo John Pink and Rick Peacock also won, with Helena Lucas second in the 2.4mR Paralympic class.
"This event was really just about honing some of our racing skills and working on our communications in the boat," said Ayton.
"It takes time to put all those sorts of things in place in a new partnership, so it's great to see that those aspects are gelling."
Double Olympic gold medallist Ayton and experienced 470 sailor Clark joined forces after the Yngling class was dropped from the Olympic schedule.
The British pair had to be patient, with light winds seeing two full days of racing cancelled in Germany.
"This gives us confidence ahead of the two big events for us this summer which are the Worlds and Skandia Sail for Gold in Weymouth," added Ayton.
Britain's three 49er crews of Pink-Peacock, Chris Draper-Peter Greenhalgh, and Dylan Fletcher-Alain Sign each topped the leaderboard at various points during the regatta.
But a final day surge by Pink and Peacock, who finished second in the medal race, was enough to hand the 2009 World silver medallists overall victory and their first World Cup win.
Draper and Greenhalgh, who led going into the final day, finished fourth overall, with Fletcher and Sign in fifth.
The final round of the World Cup series, the Skandia Sail for Gold event, takes place at the 2012 venue in Weymouth from the 9 to 14 August.