Cougar returns for Newmarket challenge Aidan O'Brien relies on Cougar Mountain to give him a first victory in the Dubai Challenge Stakes on Friday. The five-year-old has already made a successful visit to Newmarket this year, picking up the Joel Stakes a couple of weeks ago. Lumiere also returns to the scene of her most notable victory. Having claimed the Cheveley Park Stakes at the track last year, the Mark Johnston-trained three-year-old bids to register a second win of the campaign on her first start on the Rowley Mile since finishing down the field in the 1000 Guineas. The William Haggas-trained Tasleet will make his first start since winning the Greenham Stakes on his seasonal bow at Chelmsford in April, while Aclaim, from the yard of Martyn Meade, and the Mick Channon-trained Opal Tiara both step up in grade in their bid to complete hat-tricks, having been successful at Listed and Group Three level respectively on their latest starts. The John Gosden-trained Richard Pankhurst is on a recovery mission after turning in a below-par effort in the Park Stakes at Doncaster, and Roger Varian's Certificate makes a quick reappearance after finishing second in a Listed affair at Redcar on Saturday. The field is completed by four-times Newmarket winner Gifted Master (Hugo Palmer), Code Red (William Muir), Jallota (Charlie Hills), So Beloved (David O'Meara) and First Selection (Simon Crisford).
