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(...)

Aidan O’Brien: the Ballydoyle handler could now have three contenders for the Longchamp feature. Photograph: Inpho

Tapestry has emerged a possible challenger for the Prix de l’Arc de Triomphe after French racing authority France Galop said she could be supplemented(...)

Frankie Dettori will ride Ruler of the World at Longchamp. Photograph: Lynne Cameron/PA Wire

Frankie Dettori has been confirmed as the rider of Ruler Of The World in Sunday’s Prix de l’Arc de Triomphe at Longchamp. There was speculation over w(...)

Frankie Dettori is set to renew his partnership with Qatar Prix Foy winner Ruler Of The World in the Arc while Joseph O’Brien rides Chicquita. Photograph: Alan Crowhurst/Getty Images

Just half-a-dozen Irish trained horses have ever won the Prix de l’Arc de Triomphe and hopes of an addition to that most exclusive of lists this Sunda(...)

Aidan O’Brien: Ballydoyle handler will be well represented at the Group One extravaganza in France. Photograph: Lorraine O’Sullivan/Inpho

Aidan O’Brien has nominated Ruler Of The World and Chicquita as his two likely starters in Sunday’s €5 million Qatar Prix de l’Arc de Triomphe. It is (...)

Joseph O’Brien rides Leading Light to victory in the English St Leger at Doncaster in 2013. Photograph: Alan Crowhurst/Getty Images

Tomorrow’s Curragh leg of Champions Weekend faces both international and domestic competition from Arc trials day in Longchamp and the start of the 20(...)

Bracelet ridden by Joseph O’Brien before winning the Ribblesdale Stakes during Day Three of the 2014 Royal Ascot Meeting at Ascot. Photograph: Steve Parsons/PA Wire

Bracelet bounced back from her disappointing display in last month’s Qipco 1000 Guineas to give Aidan and Joseph O’Brien victory in the Ribblesdale St(...)

Anthem Alexander ridden by Pat Smullen on the way to victory in the Queen Mary Stakes on Day Two of the Royal Ascot festival. Photograph: David Davies/PA

A 17-1 double with Mustajeeb and Anthem Alexander at Royal Ascot yesterday may not help towards Pat Smullen’s pursuit of a seventh jockeys title at h(...)

Frankie Dettori:  aboard Treve for the Prince of Wales renewal and will be riding at this favourite track. Photograph: Steve Parsons/PA

It’s an equine Ladies Day this afternoon so it is only appropriate that one of the top female performers in modern times, Treve, looks set to put the (...)