The Donegal jockey won his first Group 1 for the Ballydoyle trainer after numerous big race wins for O'Brien's son Joseph

Giant Sequoia delivered an impressive display to claim victory in the William Hill Futurity Trophy at Doncaster, virtually securing Aidan O'Brien's position as champion trainer in the process.

Stablemate Sergei Diaghilev set a rapid tempo at the front of the Group One field before the contest began to develop as they approached the two-furlong marker, with the entire field racing on the stands side.

Ryan Moore aboard favourite Noble Exhibit mounted their challenge with a furlong and a half remaining, but Giant Sequoia (11-1) was moving powerfully alongside and truly accelerated when urged by Dylan Browne McMonagle, pulling three lengths clear of Andrew Balding's late-finishing Gran Dia.

The triumph marked a record-extending 13th victory in the contest for O'Brien, who had been content to overlook the winner's underwhelming run in last month's National Stakes.

He said: "He disappointed the last day, but that was when our horses were off colour.

"I'm over the moon with him really, he travelled well, quickened very well and I'm delighted for everyone at home. It's a big team effort.

"He's very classy, he could be anything next year. He was just under the weather the last day. We gave him time, his work has been lovely.

"We weren't sure about that ground, but you never know until you try. He's very classy."

O'Brien has previously claimed victory in the Town Moor showpiece with three horses who went on to triumph in the Derby.

Speaking about the Frankel colt, he remarked: "We always thought he was a Classic horse, a mile or a mile and a quarter would be no problem, but he could get a mile and a half. His dam (Pink Dogwood) was very good and she stayed.

"We always thought he was very good, a proper horse. I'd say he's a Guineas, Derby, French Derby horse, all those things.

"One of his owners is American (John Stewart), but we had four others for the Breeders' Cup so we tried to space them out a bit!".

Discussing Noble Exhibit, who was narrowly beaten into second place by Gran Dia, O'Brien commented: "He was a bit green, he was running around a lot.

"He won making the running twice and probably didn't learn a lot. Maybe in that ground he gave him the chance to run green and he got there and ran around a bit."

While Browne McMonagle has been winning countless big races for O’Brien’s son, Joseph, this was his first Group One for the Ballydoyle handler.

“He’s a great rider, that’s all you can say,” said O’Brien.

The jockey himself said: “He’s a horse who has developed plenty throughout the year, he’s a big boy to sit on.

“The race worked out perfect, it was a nice even tempo and he relaxed. I felt like halfway on it was just a matter of sitting into him and he reacted quick.

“He quickened well and when I got to the front he was having a nice look, but he’s still a big baby and he’s going to be a lovely horse next year.

“Everyone was very complimentary of him and they said he was a lovely horse and going up to a mile was always going to be a help to him. I think he’ll get further in time and he’s very solid. He’s definitely a good horse.”

He added: “That’s a first Group One for Aidan, so a big thanks for the leg-up.”