Team GB look likely to surpass the five medals they won in both Sydney and Athens with Iain Percy and Andrew Simpson in a solid position in the Star class.
The British pair finished first, second and sixth in their last three preliminary races today to remain second in the overall standings, just two points behind leaders Sweden heading into the medal race.
Percy and Simpson have 35 points, 16 ahead of fourth-placed France and need only to finish in the top eight tomorrow to clinch Britain's sixth sailing medal.
Leigh McMillan and Will Howden finished second, third and 12th to qualify for the Tornado medal race but are out of contention in ninth place.
Spain's Fernando Echavarri and Anton Paz have a three-point lead over Australia after placing seventh, first and eighth today.