Un de Sceaux (foaled 5 May 2008; French pronunciation: [ɛ̃ də so]) is a French-bred AQPS racehorse who competed in National Hunt racing.
In 2018 Un de Sceaux became the first horse to win three Clarence House chases but was disappointed at Cheltenham by Balko des Flos when attempting to regain his Ryanair crown.
In February 2020, while preparing for his sixth trip to the Cheltenham Festival, Un de Sceaux sustained a suspensory ligament injury and Mullins announced that the twelve-year-old would be retired to France.
In February he was moved up in class to contest the Grade 2 Red Mills Trial Hurdle on heavy ground at Gowran Park.
On 29 March he was matched against the Grande Course de Haies d'Auteuil winner Gemix in the Prix Hypothese over 3900 metres at Auteuil Hippodrome from whom he was receiving eight pounds.
[5] Ruby Walsh was reunited with Un de Sceaux a month later, when the gelding faced Gemix again in the Prix Leon Rambaud over the same course and distance.
After leading from the start he shook off a challenge from Sire de Grugy approaching the last fence and drew away on the flat to win by five lengths.
He faced Sprinter Sacre again in the Celebration Chase at Sandown but made numerous jumping errors and was beaten fifteen lengths into second.
Racing on very soft ground he was among the leaders from the start and drew away in the closing stages to win "very comfortably" by eight lengths from Le Grand Luce.
[15] Three weeks later the gelding was stepped up in distance for France's premier hurdle race, the Grande Course de Haies d'Auteuil over 5100 metres.
He took the lead at the tenth fence and stayed on well to win by five lengths from the Ryanair Chase winner Uxizandre with Dodging Bullets and Special Tiara in fourth and fifth.
He put in an exuberant display of jumping under Ruby Walsh to win by 1 and a half lengths from Sub Lieutenant to complete three grade ones in a row for Willie Mullins Iron Horse.
However he met stiff opposition from the Colin Tizzard trained Fox Norton and suffered his first defeat of the campaign finishing second by almost 2 lengths.
His one defeat of the season came at the Cheltenham Festival, where he started odds-on favourite in the Ryanair Chase but was beaten four and a half lengths by Balko des Flos.
The season ended on a winning note as he retained his crown in the Punchestown Champion Chase, beating stablemate and odds-on favourite, Min, by four lengths.
[17] In his first race of the season, the Tingle Creek Chase, Un de Sceaux was denied victory by the favourite Defi Du Seuil by just a neck.
[17] In February 2020 twelve-year-old Un de Sceaux was preparing for the Queen Mother Champion Chase when he suffered a suspensory ligament injury and Mullins announced his retirement.