Leopardstown's G1 Royal Bahrain Irish Champion Stakes is set to perform a remix of York's G1 Juddmonte International trifecta after Item (Frankel), Almaqam (Lope De Vega) and Constitution River (Wootton Bassett) were all declared to renew rivalry in the standout contest on yet another mouthwatering Irish Champions Weekend.With the latter favoured to exact revenge back atop home soil for the first time this term, they have drawn stalls four, eight and three, respectively, and will head a field of eight in the €1.25-million Breeders' Cup Challenge Series ticket to the GI Longines Breeders' Cup Turf. Feliz Navidad y Feliz CumpleanosEpsom's G1 Derby hero Christmas Day (Camelot) has ceded morning-line favouritism to G3 Gordon Stakes victor Enceladus (Sea The Stars) in the build-up to Doncaster's G1 Betfred St Leger and 11 will assemble on Town Moor to celebrate the world's oldest Classic's 250th anniversary edition.O'Briens Aidan, with four contenders locked in, and Joseph, boasting two, dominate entries and betting for the £700,000 14 1/2-furlong marathon and are responsible for [over] half the field and the first four in ante-post lists. Christmas Day has bagged the five box and Enceladus, wearing first-time cheekpieces with Billy Loughnane booked in for the injured Dylan Browne McMonagle, drawn widest in stall nine. TDN Rising Star Piazza San Marco (St Mark's Basilica) was the only overnight defection. History AwaitsIconic pioneers Julie Krone, Emma-Jayne Wilson, Claire Lindop, Michelle Payne, Sibylle Vogt, Hollie Doyle, Jamie Melham, Nina Baltromei, Rachel King, Seina Imamura and Mickaelle Michel have all blazed a Classic trail across the world's jurisdictions, and Saffie Osborne will rubber-stamp membership of an exclusive club if steering the leftfield option Highwayman (Persian King) to a landmark win–sporting the refurbished Secretariat colours–for Joseph O'Brien in the St Leger.Qatari champion jockey Faleh Bughenaim will create his own slice of history by doing the business aboard Al Shaqab's Hatteen (Lope De Vega), while Christmas Day can bridge a 39-year gap if becoming the first since Reference Point (Mill Reef) in 1987 to complete the Derby-Leger double. Darkness In The SpotlightTDN Rising Star Darkness Falls (Camelot) has received glowing praise from Aidan O'Brien in recent days and will seek to build upon a stunning seven-length tally at the Curragh two weeks ago.Set to depart from the six hole, he heads a cast of ten for the recalibrated G1 HKJC World Pool Golden Fleece, in which Craig Bernick's fellow Rising Star Nola Soul (Justify), drawn one, will bid to bounce back off a free-running fourth, one spot behind the reopposing Green Dreamer (Churchill {Ire}), in last month's G2 Futurity.Green Dreamer has drawn stall five, while last month's Listed Stonehenge victor Quest For Stars puts his perfect three-for-three record on the line from stall eight. Ooh MatronThe Foxrock track's stacked programme continues apace with the G1 Coolmore America “Justify” Matron Stakes and nine will head postward to the one-mile starting gate for this GI Maker's Mark Breeders' Cup Filly & Mare Turf qualifier.Joining last season's victrix Fallen Angel (Too Darn Hot), the Ballydoyle Guineas winners Precise (Starspangledbanner) and True Love (No Nay Never) will bid to lower the standard of the upwardly mobile G1 Falmouth and G1 Prix Rothschild heroine Blue Bolt (Blue Point).Precise and Blue Bolt are housed on opposite wings, while Fallen Angel is next to Blue Bolt in eight and True Love will exit trap five. Rising Star Seeks Champagne SparkleDoncaster's high-quality undercard features the decorated G2 Betfred Champagne Stakes, with TDN Rising Star Desert Castle (Frankel) set to lock horns against just five rivals in the seven-furlong launchpad.Other contenders worthy of note include Ballydoyle's Listed El Gran Senor victor Sergei Diaghilev (Wooton Bassett), G3 Acomb second Gentle Hurricane (Invincible Spirit) and G3 Prix Francois Boutin runner-up Silver Dominion (Gleneagles). Sunday BestSunday's festivities, for which declarations will be made Friday morning, switch to the Curragh and include the G1 Moyglare Stud Stakes and G1 Goffs Vincent O'Brien National Stakes. Both are Breeders' Cup Challenge Series: Win And You're In contests.TDN Rising Stars Sun Goddess (Sioux Nation), winner of last month's G1 Phoenix Stakes, and Alpha (Sea The Stars) head a Ballydoyle quintet engaged in the former, while Juddmonte's exciting Rising Star Monogram (Kingman) is one of 11 nominees remaining in the latter.Four-time Group 1 winner Scandinavia (Justify) sets a high bar in the G1 Comer Group International Irish St Leger and G1 July Cup hero Comanche Brave (Wootton Bassett) will be the one to beat if confirmed for the G1 Bar 1 Betting Flying Five, which offers a free ticket to the GI Prevagen Breeders' Cup Turf Sprint.The post Mouthwatering Saturday Fields Confirmed: Item, Almaqam and Constitution River Irish Champion Rematch Is On appeared first on TDN | Thoroughbred Daily News | Horse Racing News, Results and Video | Thoroughbred Breeding and Auctions.