After the dressage phase Yorkshire event riders Nicola Wilson and Oliver Townend are placed ninth and tenth.
They face Burghley's four star cross country course tomorrow.
30-year-old Yorkshireman Oliver Townend has risen to the challenge on Armada at Burghley Horse Trials, moving fifth at the halfway point on day two with a score of 43.7.
The combination, fourth at Burghley last year, will now look to push on in Saturday's cross-country phase. They jumped clear inside the time at Badminton earlier this year.
"He is not an easy horse, so every good result is exactly that. There were two blips, otherwise he would be closer to the lead.
"It takes a long time, especially with the older horses, to learn about their quirks, and I love riding him every day.
"Burghley has been a very lucky place for me - I've been in the top four three times during the past four years. It is an event I look forward to riding in.
"It is always a very serious cross-country course. In my opinion, it is the most difficult competition in the world to win, and it looks like another serious challenge."
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.
To keep up to date with today's scores click here for the official Burghley Horse Trials Twitter.
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.
It is said to be the greatest of England's Elizabethan houses and as you might expect, Burghley House in Lincolnshire has a history that's as spectacular as its appearance.
The secret side of the stately home in Stamford is being revealed by none other than Downton Abbey creator Julian Fellowes in a new programme on ITV tonight. Lisa Adlam has been taking a look.
Lincolnshire Police have released footage of the moment £20,000 worth of jewellery was stolen in Stamford. It happened in August, but officers have now made the CCTV images public in the hope of finding the robbers.
Lincolnshire County Council have been criticised after workmen painted double yellow lines on the streets in Stamford which failed to stick. The paint ran into the cracks of the cobblestones in the picturesque market town leaving an unsightly mess.
It is the second time the County Council have come under fire over the painting of the double yellow lines which they were forced to remove last month as they were not deemed to be straight.
Stamford's Christmas Festival is taking place today. It is the fourth year that the event has run and 20,000 visitors are expected to attend. 200 traders and exhibitors will be showing off their wares. This year the Festival will have a 1950s theme to mark the Jubilee year.
You can find out more information here.