Four times world champion Krister Bergstrom and his crew Martin Westerdahl from Sweden fought back strongly to win today's race and after discarding their forced retirement from race three, they are a close fourth on the pointscore.
Today's racing, another tactical duel in the moderate 14 knot breeze, produced the fifth winner in five races with the Swedes overtaking early leader, Australian 18-footer champion and former 505 world champion Chris Nicholson and his brother, Darren.
The Nicholsons at one stage had opened up a commanding lead of 70 seconds over the 100 boat fleet, but the Swedes got the left of the course and cut their lead by half on the third windward leg. On the gybe mark they were within a boat length of the Australians and, with better sail handling, broke away to gain the lead.
Third place went to Australians Wayne Soulsby and Paul Marsh, followed by Britain's Ian Barker and David Cripps, Britain's Paul Towers and Dan Johnson with Americans Howie Hamlin and Cam Lewis finishing seventh.
After discarding their worst race in five, Hamlin and Lewis provisionally lead the world championship with 24.0 points under the Olympic low-scoring system, closely attended by Towners and Johnson on 25.7, Baker and Cripps on 26.0, Bergstrom and Westerdahl on 27.4 and the Nicholson brothers on 30.4 points.