Sky Sports Racing ambassador Hollie Doyle marks your card for the 250th St Leger and a stellar undercard at Doncaster on Saturday - live on Sky Sports Racing - and has a look at Leopardstown.

Who stands in the way of Aidan O'Brien and a brilliant 10th success in the world's oldest Classic, the Betfred St Leger Stakes (3.35) at Doncaster on Saturday? He saddles four runners on the 250th anniversary of the great race including probable favourite Christmas Day, who is bidding to become the first Derby winner to triumph since Reference Point 39 years ago.

Aidan's son Joseph O'Brien looks the most likely opponent to spoil the Ballydoyle party with the impressive Enceladus, who steps up to Group One company for the first time after excelling in the King George V Stakes at Royal Ascot and the Group Three Gordon Stakes at Goodwood.

However, I believe Aidan can complete the feat - not with Christmas Day but with his tough stable companion PIERRE BONNARD, who finished in front of him in the Great Voltigeur Stakes at York last month. This more demanding test of stamina is what he's been crying out for, and he can write his own piece of history.