Races Betting Preview for St Leger & Irish Champion Stakes at Saturday

First run in 1776, the St Leger celebrates its 250th running this year and remains one of the most historic races in British Flat racing. The Group 1 contest is open to three-year-old colts and fillies and is run over 1m 6f on Doncaster’s Town Moor, making it the longest of Britain’s five Classics. The distance places particular emphasis on stamina, while the going is Good to Soft ahead of Saturday. There is also a substantial £700,000 prize fund, with £396,970 going to the winner.

Enceladus comes into the St Leger after progressing rapidly through the ranks during 2026. The Joseph O’Brien-trained son of Sea The Stars has won three of his five career starts, with all three victories coming consecutively this season. After opening his account in a Cork maiden, he stepped up considerably to win the King George V Stakes at Royal Ascot over 1m 4f.

He then stepped up in class again in the Group 3 Gordon Stakes at Goodwood, where he won again. The St Leger therefore represents his first attempt at Group 1 level, as well as another increase in distance. His pedigree offers encouragement for the stamina demands: his sire Sea The Stars is one of the outstanding middle-distance influences of the modern era, while his half-brother Moab has won over 1m 6f on the Flat. Enceladus remains relatively lightly raced, making his progression from maiden winner in April to Classic contender in September one of the more interesting stories in Saturday’s field.

Christmas Day arrives at Doncaster with an opportunity to add a significant piece of racing history to an already notable season. Trained by Aidan O’Brien, he won the Epsom Derby earlier in 2026 and could become the first horse since Reference Point in 1987 to complete the Derby–St Leger double in the same campaign.

His season has included success at Group 1 level alongside placed efforts in other major races, including second in the Irish Derby and third in the Great Voltigeur at York. The latter brought him into direct competition with another St Leger runner, Pierre Bonnard. Saturday’s longer trip provides a different challenge, but Christmas Day is by Derby winner Camelot and out of a Sea The Stars mare, giving him notable staying influences on both sides of his pedigree. Victory would also give Aidan O’Brien a tenth St Leger as a trainer.

Pierre Bonnard provides Aidan O’Brien with another runner with established top-level form. He became a Group 1 winner as a two-year-old by winning the Critérium de Saint-Cloud in France and has remained competitive in major races during his three-year-old season. His 2026 form includes third in the Irish Derby and second in the Group 2 Great Voltigeur at York, where he finished ahead of Christmas Day.

The son of Australia is out of a Galileo mare, a pedigree combining proven Classic and middle-distance influences. He has already performed over a range of distances, although Doncaster’s 1m 6f 115y poses a new stamina test. His previous meetings with Christmas Day also provide one of the St Leger’s notable subplots, with the pair having exchanged finishing positions during the season.

Later on Saturday, the focus moves from a British Classic stamina contest to one of Ireland’s leading middle-distance races. The Irish Champion Stakes celebrates its 50th running in 2026 and is a Group 1 contest over 1m 2f on Leopardstown’s turf course, for horses aged three and older. With €1.25 million in total prize money and €725,001 for the winner, it is one of the weekend’s richest contests. The going has been reported as Good to Yielding, and this year’s race has an especially interesting storyline: Item, Almaqam and Constitution River meet again after filling the first three places in the Juddmonte International at York.

Constitution River has already established a strong Group 1 record during 2026. Trained by Aidan O’Brien, he won the Prix du Jockey Club at Chantilly before taking on older horses in the Coral-Eclipse at Sandown, where he recorded another Group 1 success over the same 1m 2f distance he faces at Leopardstown. Those victories were part of a five-race winning sequence.

That sequence ended at York in August when he finished third in the Juddmonte International behind Item and Almaqam. Their Leopardstown rematch is therefore one of the central sporting stories of Saturday’s race. The Irish Champion Stakes also has wider international importance, with implications for major autumn targets including the Breeders’ Cup.

Item comes into the race after an excellent summer at York. The Andrew Balding-trained son of Frankel won the Group 2 York Stakes in July and returned the following month to win the Group 1 Juddmonte International, defeating Almaqam and Constitution River. The two victories marked a considerable turnaround after his earlier Epsom Derby performance.

Leopardstown now provides a different course and another major Group 1 test. His recent York form is particularly relevant because Saturday brings the first three home in the Juddmonte International back together. With major international autumn races still ahead, the Irish Champion Stakes also provides another important measure of where Item stands among Europe’s leading middle-distance horses.

At five, Almaqam brings more experience than the younger horses among the headline contenders. The Ed Walker-trained runner has already enjoyed Group 1 success in Ireland this season, winning the Tattersalls Gold Cup at the Curragh over 1m 2f in May. He later reinforced that form by finishing a narrow second to Item in the Juddmonte International, ahead of Constitution River.

Almaqam has produced his strongest performances over 1m 2f to 1m 4f and has already demonstrated his ability on Irish tracks. That combination of experience, established Group 1 form and his recent York performance gives another dimension to Saturday’s rematch. With Item attempting to confirm the York result and Constitution River returning to the distance of his Coral-Eclipse victory, their latest meeting adds another compelling angle to the 50th Irish Champion Stakes.