In the Champions Cup playoffs, Northampton will host Stade Francais on Friday night with the winner taking their place in the 2017-18 Champions Cup.
Ahsee Tuala, Nafi Tuitavake and Teimana Harrison all played for Saints as they ended Pat Lam's Connacht tenure with a 21-15 win. Jake Heenan and Naulia Dauwai were the New Zealand representation for the Irish province.
Stade Francais beat Cardiff Blues 46-21, for whom Gareth Anscombe slotted three goals and No 8 Nick Williams scored a try. Rey Lee-Lo and Willis Halaholo formed the Blues' midfield combination.
In the Guinness PRO12 semifinals, Wayne Pivac's Scarlets tipped over Leinster 27-15 on the back of a staunch defensive display. Johnny McNicholl (15) and Hadleigh Parkes (22) featured for the victors, while wing Isa Nacewa kicked two goals for Leinster. Lock Hayden Triggs was accorded a warm farewell by the Dublin crowd as the 35-year-old heads into retirement after a long career. Jamison Gibson-Park and Michael Bent were substitutes for Leinster.
Francis Saili scored a try and Tyler Bleyendaal slotted three goals as Munster booked their place in the final with a 23-3 shutout of Ospreys, for whom Kieron Fonotia and Brendon Leonard both started.
As is often the case, the French are a week behind with their scheduling, with only their first round of playoffs done and dusted.
Dan Carter's Racing-Metro upset Montpellier 22-13 to move to this weekend's semifinals, their hopes still alive of a repeat. Carter himself kicked three goals, while Joe Rokocoko scored a try. Also in the starting line-up were Chris Masoe, Ben Tameifuna and Casey Laulala.
Ma'a Nonu's Toulon defeated Castres 26-22, with fullback Leigh Halfpenny showing he is in fine form for the Lions tour, scoring 21 points, including a try. Castres fielded David Smith and Maama Vaipulu.