Sir Delius will begin his latest pursuit of the Cox Plate in Saturday’s Group 1 Makybe Diva Stakes at Flemington, almost 12 months after veterinary scans abruptly ended his previous Melbourne campaign.
The Gai Waterhouse and Adrian Bott-trained entire has been confirmed for the 1600-metre weight-for-age contest, where he will carry 59 kilograms and start from barrier nine under Craig Williams.
The race represents far more than another valuable Group 1 opportunity.
Sir Delius entered the 2025 spring as the favourite for both the Cox Plate and Melbourne Cup after winning the Underwood Stakes and Turnbull Stakes, only to be withdrawn from both races when scans identified what Racing Victoria described as a “heightened risk of injury”.
He has since returned to racing, defeated champion mare Autumn Glow in the Queen Elizabeth Stakes and received clearance to compete in Victoria without additional scans unless his connections decide to pursue the Melbourne Cup.
Now he returns to the same Flemington course upon which the 2026 Cox Plate will be held.
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Go Bloodstock representative Steve O’Connor made the motivation behind the campaign clear before Sir Delius’ autumn return.
“I think we have unfinished business in the Cox Plate,” O’Connor told Betsy.
“It’s at Flemington this year and that will suit him down to the ground, so we’d be happy to aim at that race.”
The unfinished business officially resumes on Saturday.
Sir Delius Does Not Need to Win First-Up
Sir Delius will enter the Makybe Diva Stakes after three preparatory trials rather than a competitive lead-up race.
Bott deliberately gave the six-year-old a substantial foundation before asking him to resume over a distance short of his best.
“I thought he looked really good in the trials there the other day,” Bott told SEN.
“He seems a bit sharper this preparation, looks great in his actions and stretched out really well.
“I’m delighted with the preparation for him to date. I think he’s in really good shape.”
Sir Delius subsequently won another Randwick trial despite beginning slowly, recovering before finishing strongly through the field.
That performance suggested his fitness had progressed, but Saturday remains the first stage of a campaign intended to peak over 2040 metres in the Cox Plate on October 24.
The Makybe Diva Stakes will reveal whether he has returned with the same power that carried him to three Group 1 victories last season.
However, judging his Cox Plate prospects entirely upon whether he wins over 1600 metres would be a mistake.
Sir Delius has sufficient class to be competitive at a mile, but his strongest performances have come between 1800 and 2000 metres. His principal objective will be to settle, travel comfortably and finish through the line against fully established milers.
A narrow defeat accompanied by a powerful final 400 metres could strengthen his Cox Plate credentials more than a soft victory produced by a favourable tempo.
Craig Williams Abandons Familiar Champion for Sir Delius
The jockey decision adds another compelling dimension to the race.
Williams has surrendered the ride on Mr Brightside, the horse he partnered to nine Group 1 victories, to remain aboard Sir Delius.
He has ridden Mr Brightside in 45 of the gelding’s 49 starts and guided him to victory in the past three editions of the Makybe Diva Stakes.
Blake Shinn will instead partner the Lindsay Park champion on Saturday.
Williams’ decision should not be interpreted as a declaration that Sir Delius will necessarily defeat Mr Brightside over 1600 metres. He has committed himself to the horse considered one of Australia’s leading Cox Plate prospects, while Mr Brightside’s established partnership could not be guaranteed indefinitely.
Nevertheless, surrendering the mount on a three-time defending champion is an enormous statement of confidence.
Williams already knows Sir Delius possesses the stamina required for the Cox Plate. Saturday will help establish whether the entire has developed the tactical speed necessary to win a strongly contested weight-for-age race at Flemington.
Mr Brightside Presents the First Major Examination
Sir Delius could hardly have received a more demanding return.
Mr Brightside is attempting to win the Makybe Diva Stakes for a fourth consecutive year after finishing second to Beiwacht in the Memsie Stakes at his first appearance for almost 10 months.
The nine-year-old underwent surgery to remove a small bone chip from his left fore fetlock but demonstrated at Caulfield that he remains capable of competing at the highest level.
“He’s going to look better and better every start,” co-trainer Ben Hayes told Racing.com after the Memsie.
“He’s sound and happy and he’s showed everyone he’s still got it.”
The Flemington mile is almost tailor-made for Mr Brightside. He possesses tactical speed, an exceptional record at the course and considerably more recent racing than Sir Delius.
That makes him a serious threat despite the change of jockey.
The field also contains reigning Caulfield and Melbourne Cup winner Half Yours, Australian Cup winner Light Infantry Man, Aeliana, Buckaroo, Another Wil and emerging mares Sheza Alibi and She’s A Hustler.
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Sir Delius is not returning against a collection of horses building quietly towards later targets. He is entering one of the strongest weight-for-age races assembled during the opening weeks of spring.
Queen Elizabeth Win Changed the Cox Plate Picture
The most persuasive argument for Sir Delius remains his Queen Elizabeth Stakes performance.
He entered the Randwick feature after finishing third in both the Verry Elleegant Stakes and Ranvet Stakes, then ended Autumn Glow’s unbeaten record with a dominant performance over 2000 metres.
That victory removed any uncertainty about whether the veterinary interruption had permanently diminished him.
It also established Sir Delius as an elite Australian weight-for-age performer rather than an imported horse whose reputation rested predominantly upon two spring victories.
Autumn Glow has since returned to win the Winx Stakes in race-record time and was crowned Australian Racehorse of the Year.
Defeating her therefore looks even stronger several months later.
Sir Delius will not encounter Autumn Glow on Saturday, but Aeliana, Mr Brightside and Light Infantry Man provide a suitable test of whether he has retained that level.
Veterinary Controversy No Longer Blocks Cox Plate Bid
The circumstances surrounding Sir Delius’ 2025 withdrawal remain an unavoidable part of his campaign.
Mandatory scans identified the perceived injury risk after he had already won the Underwood and Turnbull Stakes, preventing connections from contesting either of their principal Melbourne targets.
Racing Victoria subsequently confirmed that Racing NSW had overseen the requirements attached to his veterinary embargo before he resumed racing.
“We are advised by Racing NSW that Sir Delius underwent all the necessary requirements, in accordance with the Rules of Racing and his veterinary embargo, to be cleared to resume racing,” an RV statement said, as reported by The Straight.
“On that basis, the horse will be permitted to start in Victoria without the need for a further scan, unless of course the horse is seeking to compete in the Lexus Melbourne Cup.”
That distinction is important.
The Cox Plate campaign can proceed without the additional veterinary process that ended his previous spring, while another Melbourne Cup attempt would expose him to the mandatory testing applied to Cup runners.
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Connections have consequently placed the weight-for-age championship at the centre of his program.
Flemington Could Give Sir Delius His Best Opportunity
The temporary relocation of the Cox Plate from Moonee Valley to Flemington may work in Sir Delius’ favour.
Moonee Valley’s short straight rewards horses capable of accelerating quickly while navigating its tight circuit.
Flemington offers a longer straight and more time for a horse such as Sir Delius to build momentum.
He has already demonstrated his effectiveness at the course by winning the Turnbull Stakes over 2000 metres, defeating Via Sistina before she subsequently claimed the 2025 Cox Plate.
Waterhouse is still searching for her first Cox Plate victory.
Sir Delius may represent her strongest opportunity yet, but Saturday will determine whether the campaign begins with immediate authority or requires patience.
The Makybe Diva Stakes is not his grand final.
It is his first chance to prove that the horse controversially denied an opportunity last spring has returned capable of winning Australian racing’s weight-for-age championship.
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Sir Delius does not have to defeat every specialist miler first-up to remain the Cox Plate horse to beat.
But after almost a year of frustration, a commanding return at Flemington would make the unfinished-business narrative considerably more intimidating for his rivals.
