Ros and her European gold medal-winning ride Allstar B, owned by his rider and Caroline Moore, performed a fluid test to bump former Badminton winners Michael Jung and La Biosthetique-Sam FBW into second place.
Michael and Sam led for much of the afternoon on their score of 24.7.
The final combination of the day was Japan’s Yoshiaki Oiwa and The Duke Of Cavan — eighth here in 2017 — who sit in third overnight on 24.9.
This morning’s leaders Oliver Townend and Cooley SRS are now lying in seventh place on 25.9.
Badminton final scores
“I’m completely elated and very relieved — it was hard work in there and I had no idea about the marks until I had finished, so it was a shock but a great one,” Ros told H&H, adding Allstar B has been in a “great frame of mind” today.
“I’m extremely proud of him because a few years ago he couldn’t trot and he didn’t like the dressage. For him to put in a performance like that is just fantastic.”
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Michael added the going made preparations tricky with Sam, but he was particularly pleased with his canter work.
“It was not so easy this time to prepare him because of the wet ground, he doesn’t really like that,” he said.
“But he knows the job, he knows what he has to do and in the end I was very happy as he was very good to ride.”
Michael Jung after his Badminton Horse Trials dressage testPosted by Horse & Hound: Eventing on Thursday, May 3, 2018
Yoshiaki, who sits just 0.2 penalties behind Michael, said he was “really happy” with the way his horse went.
“I’ve walked the course and it is not easy — it is Badminton — I’m based in Germany, the weather conditions are quite cold and it is quite difficult to find a place to gallop,” he added.
Your guide to the Badminton Horse Trials cross-country course, one of the most challenging tracks in the world for event
There were strong performances across much of the field, with 41% of combinations who have previously competed at four-star scoring personal bests today, according to equestrian data experts EquiRatings.
Izzy Taylor and Perfect Stranger will be the first pair down the centre line tomorrow morning at 9.30am.
Read an interview with Badminton first-timer Will Furlong in the current issue of H&H (dated 3 May), plus Badminton predictions from equestrian data experts EquiRatings.
Our bumper 24-page Badminton report will be in our 10 May issue, including opinion from Oliver Townend, Mark Phillips and Peter Storr.
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Lucy is an experienced news journalist, reporter and presenter. Since joining the Horse & Hound team in 2015, Lucy has reported from major global sporting events including the Tokyo Paralympic Games and multiple European Championships, as well as Badminton, Burghley and London, to name a few. She has covered current affairs and sports news across the full spectrum of equestrian disciplines and racing, as well as human and equine welfare, industry news and court cases.
