Odds-on favourite Un De Sceaux became the first horse to claim a third consecutive Clarence House Chase with an easy win under jockey Paul Townend.
The Willie Mullins-trained 10-year-old was given a patient ride by Townend.
The 4-9 chance overtook long-time leader Speredek at the second-last at Ascot and went on to triumph by seven lengths for an eighth Grade One win.
Speredek (16-1) stayed on for second after fellow challenger Brain Power fell at the last.
Townend was happy for Speredek and jockey Sean Bowen to set the early pace but Un De Sceaux was always moving well and it was only a matter of time before the challenge was launched.
Speredek and Brain Power started to tire on the testing ground but the winner calmly went in front and although he was not the most fluid over the last, he was far too strong for his rivals.
“That ground was hard work but it was job done,” said Townend, who had the ride because of the continued absence of Ruby Walsh, who broke his leg in a fall in November.
“I rode my horse to suit him and the further we went the more confident I was getting.”
Meanwhile, The New One had to work very hard to claim a fourth win in the Champion Hurdle Trial at Haydock.
Nigel Twiston-Davies’ 10-year-old was carrying 6lb more than each of his three rivals and it looked as though Ch’Tibello would be the one to challenge when he jumped to the front at the last.
But The New One, ridden by the trainer’s son Sam, kept battling and eventually won by half a length for a 20th win in 36 starts.