The three-year-old has been cut from 5/1 to 6/1 for the Espom showpiece.
Sir Dragonet is the new hot prospect for the Derby as 97% of bets in the Derby market have gone on the three-year-old since his Chester victory on Wednesday.
Aidan O’Brien might have a new superstar as the horse's odds tumbled from 50/1 into as short as 5/1 (best price 7/1) after his eight-length win in the Chester Vase stakes.
The 49-year-old trainer had success in the 2000 and 1000 Guineas last weekend, and now has another great chance at landing the Derby for a seventh time.
Elsewhere in the market, Too Darn Hot remains the 9/2 favourite after a glittering campaign last year, whilst O’Brien’s 2000 Guineas winner Magna Grecia is 6/1 second favourite.
Oddschecker spokesperson George Elek: “Aidan O’Brien has won four of the last seven renewals of the Derby and has more than one good chance this year. It could be a special year for the trainer, even by his standards.”