Aidan O'Brien scored in the final race of the second day of Royal Ascot, taking the Listed Windsor Castle Stakes over five furlongs with Southern Hills.

This means the Irish trainer now has 68 Royal Ascot winners to his credit, and this was his third of the meeting so far.

Southern Hills, a son of Gleneagles, powered home under Ryan Moore to hold off Godolphin's Platinum Star (Saeed Bin Suroor/Christophe Soumillon) by half a length. It was his first career success and came at odds of 7/1.

O'Brien said: "He's a fast horse. The Gleneagles offspring are fast and they are brave, which are two massive things in a horse. That's evident in his stock so far.

"He handled the hold-up [when Show Me Show Me broke from the stalls, unshipped his jockey, Paddy Mathers, and cantered away loose down the track before being withdrawn] well. He's got a good mind. They [horses sired by Gleneagles] have those traits; they have pace, they are brave and they've got good minds.

"I should have thought that five or six furlongs would be his trip, because he's got so much speed."

Newmarket-based Saeed bin Suroor, trainer of the half-length second-placed Platinum Star for Godolphin, was delighted by the run of the 8/1 chance.

Bin Suroor said: "He ran very well. He has won over six furlongs, but a stiff five would be a good trip for him. We will be looking for a group race for him, he is a class horse. The ground was a bit heavy for him today."

Jockey Christophe Soumillon, added: "It went really well. I was behind the winner [Southern Hills 7/1]. I came through very easily thinking I would catch him, but my horse got a bit tired. It was a great run."