The USA also became the first nation other than Great Britain to win a Para Dressage Team event at a Paralympic Games.
Roxanne Trunnell
Her stunning Freestyle test aboard Dolton scored 86.927%, smashing the record of 84.750% set by Sophie Christiansen in London 2012.
Roxanne Trunnell (USA) breaks 80%; competition continues Sunday with the final riders in Grades IV and V to determine the team medals.
Two new Paralympic equestrian champions have been crowned at Baji Koen - Roxanne Trunnell (USA) and Tobias Thorning Jorgensen (DEN).
The fiercest Para-Dressage competition yet is set to begin in Japan, featuring 77 athletes representing 26 countries.
The third week of competition of the 2020 Adequan Global Dressage Festival at PBIEC in Wellington, Florida, featured para-dressage action.