Joseph O’Brien: to ride Ruler of the World on Champions Day, Britain’s richest raceday.

Joseph O’Brien will replace Frankie Dettori on the 2013 Derby winner Ruler of the World in the Champion Stakes at Ascot tomorrow. Dettori had ridden t(...)

Goffs in Co Kildare will hold its premier auction of thoroughbred yearlings next Tuesday and Wednesday. Photograph: f stop press

There will be blue bloods to be found both in and out of the sales ring when Goffs holds its premier auction of thoroughbred yearlings at the bloodsto(...)

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(...)

The Aidan O’Brien-trained Australia (Joseph O’Brien, right) finishes third in the Qipco 2,000 Guineas at Newmarket.

Aidan O’Brien, who has trained four Derby winners since 2001, said today (Monday) that he still believes Australia is “another step up” from any colt (...)

Ruler of the World will remain in training with Aidan O’Brien but will run in the colours of Al Shaqab Racing.

Al Shaqab Racing has purchased a “significant interest” in the Coolmore-owned Ruler Of The World, last season’s Epsom Derby winner. The f(...)

Joseph O’Brien riding Leading Light to victory in  The Ladbrokes St Leger at Doncaster. Photograph: Alan Crowhurst/Getty Images

Joseph O’Brien erased the painful memory of defeat for Triple Crown-seeking Camelot in the Ladbrokes St Leger at Doncaster 12 months ago with victory (...)

Aidan O’Brien

Cirrus Des Aigles was the clear market leader last night for the King George VI & Queen Elizabeth Stakes at Ascot on Saturday following the defect(...)

St Nicholas Abbey, ridden by Joseph O’Brien, winning the Coronation Cup. The horse suffered a “serious career-ending injury” this morning, Coolmore have confirmed.

St Nicholas Abbey’s racing career is over after picking up a serious injury at Ballydoyle this morning.The six-times Group One winner was being prepar(...)