Charlotte Dujardin underlined her Olympic medal credentials with a commanding performance to win Friday's Hagen dressage grand prix in Germany.
World number five Dujardin romped to victory aboard her intended London horse Valegro, scoring 81.426%.
The Gloucestershire-based rider triumphed by almost 5% from Germany's former Olympic champion Isabell Werth, setting herself up for the weekend's action at the prestigious four-star show.
Dujardin was part of Great Britain's European title-winning team alongside Carl Hester, Laura Bechtolsheimer and Emile Faurie in Rotterdam last August, and she made an immediate statement of intent in Olympic year.
Although her test was not faultless, illustrated by an error in the horse's second extended trot, she still impressed sufficiently for one judge to award her five perfect 10 scores.
"I am really happy with him," Dujardin said. "This is his first outdoor show this year, and he really wanted to go out there and show off.
"Last year, I was ninth here, and to win shows how much we've come on in just 12 months.
"I don't let the nerves get to me any more. I used to be dreadfully nervous.
"I couldn't remember tests, but with the help of a sports psychologist I've learned to overcome the nerves and deal with it."
Bechtolsheimer, riding her second string Andretti, finished fifth on 74.085% - the horse's second-best career grand prix score - while Faurie, riding Elmegardens Marquis, was seventh with 72.298%.