With many Heineken Champions Cup and Challenge Cup stars in action over the weekend in the Rugby World Cup, we take a look at some of the key matches taking place in Japan. England v Argentina Unbeaten England will have a host of players from Heineken Champions Cup winners Saracens in their starting XV when they face arguably their biggest test to date against Argentina in Pool C. Former EPCR European Player of the Year Owen Farrell will start at inside centre, while other familiar faces from the 2019 winners in Eddie Jones’ line-up include hooker Jamie George, lock Maro Itoje and wing Elliot Daly, who joined the European champions during the off-season. [jwplayer KBEs2zmv] Japan v Samoa Samoa boast some Heineken Champions Cup talent as they seek to cause an upset by beating Japan, who caused the shock of the World Cup so far last weekend when they defeated Ireland. They are represented by Northampton Saints wing Ahsee Tuala, Bristol Bears prop Jordan Lay – who has recently spent time on loan at Ospreys – and ASM Clermont Auvergne full-back Tim Nanai-Williams, who won the Challenge Cup with the French side last season. France v Tonga France can all but secure a spot in the last eight of the World Cup with victory over Tonga on Sunday in a match that will highlight both Heineken Champions Cup and Challenge Cup players. Toulouse fly-half Romain Ntamack returns to the starting XV to form a half-back partnership with RC Toulon scrum-half Baptiste Serin, while Racing 92’s Virimi Vakatawa and Toulouse’s Sofiane Guitoune make up an intriguing centre duo. Tonga are can call on the likes of Leicester Tigers full-back Telusa Veainu and back-row forward Sione Kalamafoni, as well as Ospreys prop Ma’afu Fia.