St Nicholas Abbey in a driving finish, ridden by Joseph O’Brien, surges to the finish line to win the Breeders’ Cup Turf during the 2011 Breeders’ Cup World Championships at Churchill Downs, Kentucky, in 2011. Photograph: Matthew Stockman/Getty Images

It is less than three years since Joseph O’Brien burst on to racing’s international stage with St Nicholas Abbey’s Breeders’ Cup success, the sound(...)

Moment of strewth: Joseph O’Brien acknowledges the crowd after his victory on Australia in the Investec Derby at Epsom racecourse. Photograph: David Davies/PA

Australia might have injected the greatest possible substance into his already stratospheric reputation with a resounding Epsom Derby victory but even(...)

 Declaration Of War has a run-out at Santa Anita for tonight’s Breeders’ Cup Classic. Photograph: Jeff Gross/Getty Images

Declaration Of War is unlikely to ever be regarded as the most talented horse ever to go through Aidan O’Brien’s hands but if he can deliver Ireland’s(...)

Joseph O’Brien on Camelot pulls away from Seamie Heffernan on Triumphant to win The High Chaparral European Breeders Fund Mooresbridge Stake at the Curragh. Photograph: Inpho

Multiple Classic winner Camelot made a winning return to action in the High Chaparral European Breeders Fund Mooresbridge Stakes at the Curragh(...)