Northampton marched to a 40-17 Premiership bonus-point win over 14-man Leicester as they reinforced their status as table toppers on derby day.
Harlequins produced a stunning upset as they reached the Champions Cup semi-finals by beating French heavyweights Bordeaux-Begles 42-41.
Northampton charged through to the Investec Champions Cup quarter-finals with a 24-14 win over Munster.
It's been eight years since the Premiership had more than three clubs make it to the Champions Cup quarter-finals, but there remain six in play this season.
Northampton showed why they are top of the Gallagher Premiership, beating champions Saracens 41-30, while Leicester held off Newcastle in a dramatic 19-13 victory.
England internationals Kyle Sinckler and Lewis Ludlam will join Toulon next season, the French club's president Bernard Lemaitre said.
England pair Marcus Smith and Alex Mitchell to join up with the rest of the squad on a three-day Six Nations training camp to continue rehabilitating their injuries.
Northampton Saints have announced Courtney Lawes will leave the club at the end of the 2023/24 season to join French side CA Brive.