Reigning Olympic dressage champion Charlotte Dujardin led a British clean sweep in the opening feature class of the London International Horse Show at Olympia.
Dujardin guided her Tokyo 2020 Olympic hopeful Mount St John Freestyle to an emphatic victory in the World Cup grand prix.
Their score of 81.553 per cent proved far too good for the rest of a 16-strong field.
And it will confirm the combination as firm favourites to complete a double by taking Tuesday's World Cup freestyle competition.
Dujardin's Great Britain team-mates Carl Hester - riding Hawtins Delicato - and Charlotte Fry, on Everdale, finished second and third, respectively.
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