Aidan O’Brien, whose stable has become the dominant force this century in the Derby, has made the surprise announcement that he will have just one runner in the Epsom Classic on Saturday.

The Ballydoyle trainer is to rely on Bolshoi Ballet, the 7/4 favourite, while High Definition is set to run in the Irish Derby at the Curragh this month in a major switch in pre-race plans. O’Brien’s decision resulted in Bolshoi Ballet ending the day as even-money market leader and Frankie Dettori, who was expected to get the call-up for High Definition, swapping to ride John Leeper.

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