Overseas Wrap: Kirchner stunned
Zane Kirchner's Leinster were stunned by a resurgent performance from the Northampton Saints in the Heineken Cup on Saturday.
Having hammered the English side away from home the week before, Leinster went down 18-9 at the Aviva Stadium in Dublin.
Juan Smith was on the winning side as Toulon rediscovered their groove with a bonus-point win over Exeter Chiefs, with Bakkies Botha, Danie Roussouw and Bryan Habana all out injured. The champions remain top of Pool 2.
Schalk Brits, Alastair Hargreaves, Ernst Joubert and Neil de Kock were all on the bench for Saracens in their nine-try rout of Zebre, with Jacques Burger starting at openside flanker and scoring in the 64-3 victory.
Schalk Ferreira started at loosehead prop for Toulouse as they gained revenge over Irish side Connacht for their shock defeat in Round 3, with Chilliboy Rallepelle and Gurthrö Steenkamp appearing off the bench.
George Earle and Jo Snyman were on the losing side for the Scarlets against Clermont, while Ruan Pienaar started at scrumhalf for Ulster with Johann Muller in the second row in their 35-3 win over Treviso. The Irish side are currently top of Pool 5 ahead of Leicester.
The Tigers took down Wynand Olivier's Montpellier in France to set up a key battle between themselves and Ulster in Round 6.
BJ Botha's Munster squeaked home thanks to a late try against Perpignan, while Juandre Kruger was on the bench for Racing Métro's 17-3 loss to Harlequins.
Rory Kockott kicked four penalties as Castres slumped to a 21-12 loss to the Ospreys in Wales, leaving the Top 14 champions third in Pool 1.
Tyrone Holmes and Josh Strauss ended up on the losing side for Glasgow in a drab 7-9 loss to Cardiff Blues, but there were better fortunes for the other Scottish side, Edinburgh.
Cornell du Preez, Izak Van Der Westhuizen, WP Nel and Wicus Blaauw all started in the pack as Alan Solomons' team won 16-10 at Gloucester.
In the Challenge Cup, former Sharks and Tuks lock Mike Williams started for Worcester as their dire season continued with a 33-25 loss to Biarritz.
Kevin Buys' Bordeaux had a 20-9 win over Bucuresti, who featured lock Johan van Heerden, while Christoffell Johannes du Plessis and Joubert Prinsloo Horn were both on the losing side for Viadana against Dewald Senekal and JC Van Rensburg's Bayonne, who scored 12 tries in an 80-19 win.
Finally Michael van Vuuren was one of four try-scorers for Stade Français against London Irish, with Meyer Bosman and Gerhard Mostert starting and with Anton van Zyl and Morné Steyn on the bench.