ParisLongchamp on Sunday is set to feature some massive names in the sport with the Group One Juddmonte Grand Prix de Paris the feature race of the day.
The first big name that is set to feature is the shock Epsom Derby winner Serpentine, who ran away from the classy field to take the Classic contest by close to six lengths.
The son of Galileo has been waited patiently on since that run and again could be joined by a host of stablemates in the race including Mogul, Tiger Moth and Nobel Prize.
The Derby winner is the 6/4 favourite to land the Grand Prix De Paris and is currently priced at 20/1 to take the Arc after that race, but if he wins on Sunday that price will be sure to be halved.
O'Brien has landed the race for the last two seasons with smart performances from Japan and Kew Gardens and he has a huge chance again with Serpentine.
11 runners are currently entered for the Group One contest on Sunday with the only British raider being the disappointing English King that offered so much when landing a Derby Trial at Lingfield but has since looked a shadow of the horse he was expected to be.
The other feature race on a jam packed day of racing at the French track is the Qatar Prix Vermeille which is set to feature Irish Oaks winner Even So and Group Two winner last time out Dame Malliot.
From a home perspective the Jean-Claude Rouget trained Raabihah, who the trainer has talked up massively ahead of the Prix de l'Arc de Triomphe, will try her hand in black type company again after landing a Group Three last time out but before that finished a close fourth in the French Oaks.
Roger Varian could through Ebor festival winner Gold Wand into the mix for the race but it looks unlikely with the filly having a tough race just over a week ago.
Finally, the greatest stayer on the planet Stradivarius will reignite his rivalry with Epsom Derby winner Anthony Van Dyck in the Prix Foy on Sunday with the contest being used as a prep race for the Arc.
Stradivarius is currently 14/1 to land the Arc after his superb staying exploits this term, having landed a third consecutive Gold Cup and Fourth Goodwood Cup.
Stradivarius finished two and a half lengths behind Anthony Van Dyck when they clashed with Ghaiyyath in the Coronation Cup at the start of the season over 1 mile 4 furlongs, which again should set up a nice clash.