Hogh-Christensen's great start to London 2012 saw him pick up a third bullet of the regatta today, before holding off a late surge from Ainslie to finish second ahead of him in the day's final Finn race.
'As I said yesterday, it is about going out and focusing on every single race,' he said.
'I had a very good first race, a perfect start, a perfect first beat and led all the way around.
I had a very good first race, a perfect start, a perfect first beat and led all the way aroundJonas Hogh-Christensen
'That was great and in the second race I actually thought I started too early and started returning.
'When I saw the flag wasn't up and I wasn't early, I re-started and was a bit behind everyone else.
'I fought as hard as a I could to get back and then just focused on getting second.'
Another sailor shining on the south coast is Ireland's Annalise Murphy in the Laser Radial class.
The 22-year-old Olympic debutant has won all four races so far and shows no signs of letting up.
'It can't get much better than winning the first four races, but there's still six fleet races left so it's going to be really tough,' she said.
'All of the girls are really good and I think I've had a bit of luck and things have gone my way, but that doesn't always happen in sailing.
'I'm trying not to look at the forecast. We've got a forecast guy and he tells us in the morning what's going to happen.
'I don't want to think about it too much but if you start speculating on the forecast you're just going to get obsessed with what could happen.'
In the day's other highlights, British Star duo Iain Percy and Andrew Simpson are reigning supreme on home waters and sit four points clear of nearest rivals Brazil heading into tomorrow's rest day.
Percy and Simpson easily won their first race this afternoon ahead of Robert Scheidt and Bruno Prada, who went on to win the final race ahead of the Brits.
Australia's Nathan Outteridge and Iain Jensen continued to lead the 49er class after finishing second to New Zealand in the first race and fourth in the second, having capsized when leading.
The reigning Laser champion, Paul Goodison, went for treatment for muscular pains after the start of racing yesterday, where he posted a 10th and 23d.
Goodison returned to action today and finished 16th in race three, before showing some of his true potential to finish second in race four. However, the GB man faces an uphill struggle.
The RS:X classes got under way, with Dorian van Rijsselberge leading the way in the men's after winning both races.