Trials prompt Arc shake-up
Orfevre and Treve were vying for Prix de l'Arc de Triomphe favouritism after Sunday's trials at Longchamp.
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The latter came from a tricky position to land the Prix Vermeille under Frankie Dettori and was cut to a best of 5/1 by Stan James, having been 8/1 previously.
Last year's Arc runner-up Orfevre then obliged in the Prix Foy, impressing to the extent that sportingbet made him a 5/2 favourite for the October feature and William Hill just a shade bigger at 11/4.
Although most firms were less drastic in their reaction, with Boylesports and Coral initially offering 5/1, the general consensus appeared to be that Orfevre deserved to head the revised betting from Treve.
Hayley O'Connor of Ladbrokes said: "Orfevre looks right on target to avenge his defeat in this year's Prix de l'Arc de Triomphe, while Treve oozed talent in the Prix Vermeille.
"They're equally formidable contenders in our book for what's shaping up to be a spectacular renewal."
Orfevre's Japanese compatriot Kizuna earlier won the Prix Niel from a fast-finishing Ruler Of The World, and both were slashed for the Arc as a consequence.
Kizuna had been as big as 16/1 prior to the race but was cut to half that price, while Epsom Derby winner Ruler Of The World was cut to 9/1 from 33s by Stan James and no bigger than the 10/1 quoted by Sky Bet and William Hill.
Flintshire was the disappointment of the race, finishing fourth having been sent off at 13/8, and having been Arc favourite with several firms since winning the Grand Prix de Paris two months prior to Sunday's contest he was pushed out to 10s by several layers.
Ocovango finished third having previously filled the same spot behind Flintshire when appearing unlucky, and although unchanged at 25/1 with Boylesports he was cut to as short as 14/1 in places.
"A superb Sunday of racing has really helped shape the betting for the Arc," said William Hill's Jon Ivan-Duke.
"Treve went favourite for the Arc after her win in the Prix Vermeille, only for Orfevre to overtake her at the head of the market following the Prix Foy."
Novellist wasn't in action on Sunday but with several of his rivals having impressed he was eased to 6/1 by sportingbet, while Intello was pushed out to 12s for the same reason.