Great Britain's Natasha Baker laid down an emphatic equestrian gold medal marker at Greenwich Park on Saturday.
The Paralympic Games debutant took a clear lead aboard Cabral in the Grade II individual championship.
Their score of 76.857% - a Paralympic Grade II record - put them way ahead of closest challenger, Italian Silvia Verati, but Baker's early draw meant she faced more than a two-hour wait before discovering her fate.
Her main rival, Germany's Britta Napel, is drawn near the end of a 23-rider competition and is defending the Paralympic title she won four years ago.
Triple 2011 European gold medallist Baker underlined the strength of her partnership with Cabral as Britain's five-strong dressage team awaits its first medal in London.