A wrap of the Round 4 action in the European Champions and Challenge Cups.SA timesCHAMPIONS CUPFriday, 20 JanuaryLyon 31-7 Bulls - MATCH REPORTLeicester 26-27 OspreysSaturday, 21 JanuaryNorthampton v La Rochelle - 15:00Harlequins v Sharks - 15:00Bordeaux Begles v Glouchester - 17:15 Leinster v Racing 92 - 17:15Exeter v Castres - 19:30Stormers v Clermont - 19:30Ulster v Sale - 22:00Sunday, 22 JanuaryMontpellier v London Irish - 15:00Toulouse v Munster - 17:15Edinburgh v Saracens - 19:30CHALLENGE CUPFriday, 20 JanuaryToulon 14-5 ZebreBristol 33-19 PerpignanGlasgow Warriors 19-19 BathSaturday, 21 January Bayonne v Scarlets - 15:00Brive v Cardiff - 17:15Benetton v Stade Francais - 17:15 Newcastle v Connacht - 19:00Sunday, 22 January Dragons v Lions - 15:00Cheetahs v Pau - 17:15