Keelan Giles added another pair of tries to his collection as Ospreys coasted to a 59-7 Challenge Cup win over Grenoble.
Zack Holmes kicked two late penalties to give La Rochelle a 25-19 win over Toulouse and move back into second place.
Toulon mauled Bayonne 82-14 at Stade Felix Mayol, while Toulouse slipped to a 21-19 loss at Brive.
Jonny May made a try-scoring comeback to help Gloucester open their European Challenge Cup campaign with a 47-27 away win over Bayonne.
Ulster Rugby have signed Georgian tight-head prop Anton Peikrishvili in a bid to ease their front-row injury crisis.
Wasps have confirmed Italian international prop Lorenzo Cittadini is leaving the club to join Bayonne for next season.
Champions Cup holders Saracens have been drawn against Toulon while Bath will meet Bristol in the Challenge Cup.
Lionel Beauxis missed with the last kick of the game to cost Bordeaux-Begles a place in the Top 14 play-offs.
Dodgy refereeing, French figures and a sleeping giant's awakening feature in Rupert Cox's weekly blog.
Team of the week includes strong semi-finalists and leaders of the pack from the Top 14 and Super Rugby.
Oyonnax stunned Clermont Auvergne at the Stade Marcel-Michelin and Toulon capitalised by winning away in Grenoble.
Stade Francais recorded a thrilling 40-26 win over Clermont Auvergne, while Toulouse came from behind to shock Toulon.
Rupert Cox shares his highlights from the week's rugby action in his round-up blog.
Toulon once again find themselves at the top of the French domestic league thanks to a five-try win over Brive.
French club Bayonne have signed England-capped back Mathew Tait and All Black Tom Taylor.
Bordeaux came back from an 11-point deficit to defeat Toulon 28-23 in the Top 14 at the Stade Chaban Delmas.
Clermont and Stade Francais both suffered losses in the Top 14, leaving them locked together with new leaders Toulon.
Toulon put their Steffon Armitage woes to one side to beat Bayonne 24-17 in the Top 14 on Friday.
Newcastle, Exeter, London Irish, Cardiff and Connacht recorded bonus-point wins in the Challenge Cup.
France full-back Scott Spedding will leave Bayonne to play for Clermont next season.
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