Bookmakers feel Aidan O'Brien has every chance of making history on Champions Day at Ascot this weekend.

U S Navy Flag provided the Ballydoyle maestro with a 24th Group 1 winner of 2017 when landing the Dewhurst Stakes at Newmarket last Saturday, leaving him just one short of the record set by American trainer Bobby Frankel in 2003.

Johannes Vermeer will give the trainer the chance to equal the feat when contesting the Caulfield Cup in the early hours of Saturday morning before the afternoon action in Berkshire.

With the likes of Churchill, Caravaggio and Rhododendron entered across four top-level events at Ascot, William Hill offer just even-money that he saddles one Group 1 winner.

Two winners is 3/1, three is 16/1 and it is 100/1 that he takes out all four Group 1s.

The firm make it a 2-1 chance that he leaves the track empty handed.

"It would be fantastic if Aidan O'Brien can break the record on Champions day and the odds suggest he has every chance," said William Hill spokesman Rupert Adams.