Cannot play media. Sorry, this media is not available in your territory.
Video - Plain sailing for Brits on day two
Great Britain's Ben Rhodes and Stevie Morrison moved to top of the standings in the 49er class after three races in the Olympic sailing regatta.
The duo were fourth in the first race, third in the second and finished fifth in the final race of the day.
The 2007 world champions ended the day with 12 points, one ahead of the Italian team while Denmark were third.
Team GB maintained their overall lead in the Yngling class, while Ben Ainslie moved to second in the Finn class.
Ainslie narrowed the gap on leader Zach Railey of the US to five points after winning race four by six seconds from the American.
The Briton finished fourth in race three and trailed the leader by 39 seconds after reaching the final mark of race four in seventh.
But an impressive final leg saw the 31-year-old claim victory, which moved him up to 16 points.
Ainslie, who is attempting to surpass Rodney Pattison as Britain's most successful Olympic sailor, was pleased with his performance.
"All things considered, it was a good set of results with a fourth and first. I had a few issues but it was pleasing to come away with two solid results," he said.
"It's difficult but in my position I just want to stay out of trouble and it almost forces you to be too cautious and you end up giving away quite a bit of distance to stay out of trouble.
"But that's the nature of the Olympic Games. As I've learned in the past, you just have to keep your nose clean and hopefully stay out of trouble. So far, I've managed to do that.
He added: "I'm quite pleased with how things have gone so far. I'm happy being there in the hunt but there's still a long way to go yet so I've just got to keep trying hard and keep pushing."
Rhodes and Morrison are one point ahead of the Italian team
In the Yngling class, Sarah Ayton, Sarah Webb and Pippa Wilson finished fourth and seventh in race three and four respectively.
The British trio made a poor start in their second race and finished nearly two minutes behind the winning Norwegian boat for their worst result so far of the regatta.
But they still managed to stretch their lead in the standings to seven points over second-placed Finland.
Wilson said: "It was a really tough day with a lot of changes happening on the course and the lead changing up and down but our processes as ever helped us during the race and at crucial times.
"As always, we kept our heads down and tried to make the best of the situation we got.
"We're going out there to enjoy the racing and so far, so good. Every day we're just concentrating on the next race and the next thing the best we can."