Today on Sky Sports Racing: Diamond Necklace headlines at Deauville

Diamond Necklace looks to make it seven from seven in the Prix Jean et Louis Romanet at Deauville, on a card that also features a hotly-contested Prix Morny; we also have competitive Flat action from Brighton and Worcester, live on Sky Sports Racing from 12.58pm

We have a busy day's racing on Sunday with action from Brighton, Worcester and Deauville, live on Sky Sports Racing...

All eyes will be on Diamond Necklace as she heads a stellar field for the Group One Sumbe Prix Jean et Louis Romanet .

Aidan O'Brien's crack three-year-old filly has won all six starts with four coming in Group One company. A dominant winner of the Nassau at Goodwood last month, she again tackles her elders and will be expected to make it seven in a row.

Rebel Moon is a lively contender for Joseph O'Brien with Dylan Browne McMonagle in the saddle. She caught the eye when fourth in the Irish Oaks and may be capable of better.

Last year's Prix Vermeille winner Aventure looks the main danger for Christophe Ferland. She probably was not at her best behind Calandagan at Saint-Cloud and is better judged on her Group Two victory in May.

A stunning renewal of the Sumbe Prix Morny sees Orthodox and Man's Best Friend among eight runners.

Aidan O'Brien is triple-handed with Man's Best Friend the pick of Ryan Moore. Fourth on debut, he stepped forward to land a Naas maiden before running out a ready winner of the Group Two Richmond Stakes at Goodwood. That form puts him in the mix with the promise of better to come.

Great Barrier Reef had a setback after winning the Coventry Stakes at Royal Ascot and must be tracked in the markets.

Norfolk Stakes winner Orthodox is a fascinating runner for Clive Cox. He stormed away over that stiff five furlongs and the step up to six furlongs should hold no fears.

Senorita Bonita outpointed Libertango at Newmarket on her last start and with that runner scoring at York this week, she must be feared.

Get racing news on your phone Never miss a story with all the latest racing news, interviews and features on your phone. Find out more

A fiercely-competitive rendition of the Brighton Summer Series Final as the Blackmore Equestrian Construction Handicap arrives at 3.50pm.

Arnaz represents Mark Loughnane with son Billy in the plate. He is in great spirits after a pair of wins at Chepstow and should remain of interest in this warmer heat.