The test event - which doubles as the first round of the 2019 World Cup Series - will take place at the Olympic venue at Enoshima, 70 kilometres south of Tokyo, from September 9-16. Read more
At 54 Lange is the oldest competitor at the sailing, he has had the pleasure of watching his sons represent their nation in the 49er, and he has survived cancer in the past year.
Caleb Paine of the USA won the medal race but Scott dominated the class.
In the Women's division, the British pair has already secured the Gold.
The Kiwis have an amazing 34 points lead, while Outteridge and Jensen need to put a boat between themselves and Germany to take Silver.
A penalty turn on the final run almost cost Sante Lange and Cecelia Saroli (ARG) but they recovered to cross in sixth, just enough for the Gold.
Tonci Stipanovic attacked the Australian but Burton turned the tables.
Annalise Murphy was briefly in Gold medal position but was happy to settle for Silver after the disappointment of London.
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Brazilian hopes were boosted when Martine Grael and Kahana Kunze briefly hit the lead in the 49erFX.
Jake Lilley benefitted from the DSQ of a sailor who beat him in the final race, leap-frogging him into the medal race over a sailor who beat the bloke who was disqualified.
Leading after the first two races of the day, a 17th in the final race of the series makes a medal possible but the Gold unlikely.
The gap has blown out to 11 points with one more day of sailing before the medal race.
The British champion has a huge 24 point lead and the Silver also looks a foregone conclusion.
The womens division was close right to the end in the light conditions which favoured the good pumpers.
A second disqualification on their scorecard leaves them 20 points behind their British rivals with two or at most three more qualifying races left to sail.