St Nicholas heads O'Brien Racing Post entries St Nicholas Abbey heads Aidan O'Brien's six remaining entries for the Racing Post Trophy at Doncaster on Saturday. The son of Montjeu was made favourite for the Investec Derby after winning the Beresford Stakes last time and is joined in the six-day acceptors by Royal Lodge winner Joshua Tree. O'Brien has also left Air Chief Marshal, Jan Vermeer, Midas Touch and Utrillo in the race. The unbeaten Elusive Pimpernel and Peter Chapple-Hyam's much-vaunted Coordinated Cut feature among the home team. Godolphin have both Al Ghazal and Al Zir entered while Shakespearean could represent Mark Johnston.