O'Brien quartet among Racing Post 9 Aidan O'Brien is responsible for four of the nine entries for Saturday's Group 1, Racing Post Trophy at Doncaster. His quartet is headed by the much-vaunted Camelot, a wide-margin winner of his only start to date at Leopardstown in July. Stablemate Daddy Long Legs who won the Royal Lodge at Newmarket is included while the master of Ballydoyle could also call on the progressive Learn and Gowran maiden winner Tibet. Farraaj (Roger Varian) and Zip Top (Jim Bolger) who finished second and third in the Somerville Tattersall Stakes at Newmarket are set to renew rivalry while John Gosden's Fencing was an impressive winner of the Washington Singer at Newbury. Godolphin's Encke and the Jeremy Noseda-trained Talwar complete the field.