Aidan O’Brien:  he saddles half of the four runners  in the Group One Criterium International at Longchamp. Photograph: Laszlo Geczo/Inpho

The Andrew Balding-trained Kameko isn’t the best horse in action this weekend but might just be the most important. Only his presence prevents Doncas(...)

 Frankie Dettori and Enable will bid  to complete a remarkable hat-trick of Prix de l’arc de Triomphe victories  at Longchamp. Photograph:  Alan Crowhurst/Getty Images

Frankie Dettori and Aidan O’Brien have been Arc allies in the past but it will be very different story on Sunday when the Italian rider and Enable go (...)

Jessica Harrington: “I’ll talk to connections before Sunday, but it’ll be one of them taking her chance, probably Albigna.” Photograph:   Alan Crowhurst/Getty Images

A year after Alpha Centauri’s stellar career ended in shock defeat at “Irish champions weekend” Jessica Harrington is aiming for a happier Group One o(...)

 Colin Keane riding Mustajeer (right) to victory in the  The Sky Bet Ebor at York in England. Photograph:  Alan Crowhurst/Getty Images

Having landed Europe’s richest handicap with Mustajeer on Saturday, Ger Lyons is considering his options in terms of testing Siskin’s classic potentia(...)

Aidan O’Brien: top trainer will once again have a formidable team of horses bidding for top prizes at Royal Ascot.  Photograph:  Steve Parsons/PA

Aidan O’Brien is hot favourite to be crowned top trainer for a tenth time at Royal Ascot this week although his two sons, Joseph and Donnacha, will h(...)

Ryan Moore: faces a busy schedule on Saturday with rides at Doncaster and Leopardstown. Photograph: Oisin Keniry/Inpho

  Ryan Moore is set for a Saturday dash between Doncaster’s William Hill St Leger and the QIPCO Irish Champion Stakes at Leopardstown. There are(...)

Saxon Warrior and  Roaring Lion at Doncaster last year. Roaring Lion will face French Derby winner Study Of Man at Leopardstown on Saturday. Photograph: Alan Crowhurst/Getty

The French Derby winner Study Of Man is set to take on ante-post favourite Roaring Lion in next Saturday’s €1.25 million QIPCO Irish Champion Stakes a(...)

 Speak In Colours (centre), ridden by Donnacha O’Brien,  wins the Qatar Racing & Equestrian Club Phoenix Sprint Stakes at the  Curragh in August. Photograph: Inpho

 Gordon Lord Byron (2013) is the only Irish-trained horse to win the Haydock Sprint Cup in the last 45 years although both Aidan and Joseph O’Bri(...)

Winner Leading Light ridden by Joseph O’Brien celebrate their victory in the Gold Cup during Day Three of the 2014 Royal Ascot Meeting at Ascot. Photograph: David Davies/PA Wire

Hot favourite Leading Light narrowly denied the Queen’s defending champion Estimate in a pulsating climax to the Gold Cup at Royal Ascot.Last year’s Q(...)