AIDAN O’BRIEN insists he will not let his “disaster day” at Monmouth Park last year cloud his enthusiasm for this year’s Breeders’ Cup Classic.

Johnny Murtagh is poised to ride Duke Of Marmalade rather than stablemate Henrythenavigator in the Breeders’ Cup Classic at Santa Anita on Saturday week.

Curlin has the opportunity to break the all-time American earnings record held by Cigar in Saturday’s Jockey Club Gold Cup at Belmont Park.

Coral were not impressed by Big Brown’s comeback win on Sunday and cut Henrythenavigator for the Breeders’ Cup Classic as a result.

Ante-post favourite Big Brown must defy a welter of statistics if he is triumph from the outside draw in Saturday’s Kentucky Derby.