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(...)

 Ryan Moore riding Found (blue and orange colours)  to victory in the  Prix Marcel Boussac  at Longchamp  in Paris. Photograph: Alan Crowhurst/Getty Images

Full Mast was named the winner of the Prix Jean-Luc Lagardere at Longchamp after first past the post Gleneagles was demoted to third by the stewards.H(...)

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(...)