David Strettle and Chris Ashton each scored two tries as Saracens claimed a bonus-point 30-23 win over Clermont in their European Champions Cup match at Allianz Park on Saturday.
Zac Guildford went over twice for Clermont, who will feel they missed a great opportunity after dominating large periods of the game.
Meanwhile, Harlequins were made to work hard for a 25-9 victory over Castres at The Stoop in the first ever Champions Cup match on Friday night.
On Saturday, Ian Keatley's last-gasp drop goal handed Munster a 27-26 win away at Sale, Mark Bennett scored two tries as the Glasgow Warriors cruised to a bonus-point 37-10 victory over Bath, Leicester were forced to hold off a ferocious Ulster fightback on their way to a 25-18 win at Welford Road, and Marc Andreu's late try denied Northampton a bonus point in a 20-11 win.
Round 1 results (Friday & Saturday):
Harlequins 25 Castres 9
Sale Sharks 26 Munster 27
Saracens 30 Clermont Auvergne 23
Glasgow 37 Bath 10
Leicester 25 Ulster 18
Racing Métro 20 Northampton 11
Ospreys vs Treviso (14:00)
Toulouse vs Montpellier (14:00)
Toulon vs Scarlets (16:15)
Leinster vs Wasps (18:15)
Photo: David Rogers/Getty Images