Germany's Ingrid Klimke comfortably maintained her overnight lead at the Land Rover Burghley Horse Trials in Lincolnshire as the early starters failed to make an impression.
Klimke, who won team gold and individual silver at last week's European Championships in Sweden, held pole position with a dressage score of 39.0 penalties on FRH Butts Abraxxas.
And in damp, murky conditions - a stark contrast to yesterday's warm sunshine - only Jodie Amos, of the first eight riders, went under 50.
Amos posted 49.5 penalties for equal 11th place aboard Matt, the bay gelding she guided to sixth spot at last year's Bramham International competition.
But France's Astier Nicolas, a European team bronze medallist last weekend, could only score 50.3 aboard Quickly du Buguet, and former Great Britain international rider Jeanette Brakewell recorded 55.5 on Let's Dance.
Klimke, though, was likely to be threatened by a group of later starters that featured former European individual champion Pippa Funnell, 2009 Burghley winner Oliver Townend, world number two William Fox-Pitt and current Badminton title holder Jonathan Paget.
The top event riders from around the world are in Lincolnshire for the next few days for one of the sport's toughest competitions, Burghley Horse Trials. Sixty seven horse and rider combinations will battle it out to win the grand prize of £60,000.
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