Khalid Abdullah unearthed a possible understudy to Vodafone Derby favourite Twice Over as Doctor Fremantle thrilled a sun-drenched crowd in the Bank Of America Chester Vase.

The Saudi Arabian prince will see Twice Over tested at York next week and should he fail the Sir Michael Stoute-trained son of Sadler's Wells could be added to the Classic field for £75,000.

However, connections are more inclined to target the Dubai Duty Free Irish Derby with the 11-8 favourite after he scored by half a length under stable jockey Ryan Moore.

The colt raced keenly in an event dominated by a stop-start pace, before finding a dream opening as the runners fanned off the final bend to hold the persistent challenge of St Leger-bound All The Aces.

Abdullah's racing manager Teddy Grimthorpe said: "He missed the break slightly and it was a muddling race, but the split came nicely against the rail and he quickened well.

"He is not in the Derby, but he is in the King Edward VII and the Irish Derby and I think we'll look at that route.

"We will bring him on and if he is good enough I imagine he will go for the Irish Derby.

"We would not be thinking of supplementing for Epsom at this stage and Twice Over is our main Derby contender at the moment.

"He will run in the Dante next week and is in good form."

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