Ruler Of The World has become the lowest rated horse of any Investec Derby winner this century.
The British Horseracing Authority's senior handicapper Phil Smith gave Aidan O'Brien's horse a figure of 120 following his Epsom Derby victory on Sunday.
Sir Percy, the winner in 2006, was previously the lowest with a mark of 121 but Smith insists that the 120 mark is not the limit for Ruler Of The World.
Speaking on his BHA blog, Smith said: "I have Ruler Of The World performing to 120 at Epsom. He went two lengths clear (3lb) and then appeared to idle a little close home. I have agreed this figure with Garry O'Gorman, who is senior handicapper on the Flat for the Irish Turf Club.
"I am sure this will not be the limit of Ruler Of The World's ability level."
The unbeaten Colt surprised many by beating favourite Dawn Approach. There were doubts over Dawn Approach's stamina but it looked like Jim Bolger's horse could win as expected when he led up the hill.
But the horse, having not previously ran over the mile-and-a-half distance, struggled and was beaten by a long distance by Ruler of The World and eventually finished last.
Plans remain uncertain for the horse after his torrid Derby experience but it's been revealed that his rating will be left on 125. This rating means that Dawn Approach remains the best three-year old in Europe.
Libertarian came in second place with Smith giving the horse a mark of 117, just behind Ruler Of The World.
"Certainly they all have bags of improvement in them, particularly Libertarian on a more galloping track and perhaps over a couple of extra furlongs," said Smith.
Oaks winner Talent was handed a mark of 114 which was the third lowest Oaks winner rating this century.
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