Wins for Leinster, Scarlets, Cheetahs and Edinburgh
There were derby victories for the Scarlets and Leinster while the Cheetahs and Edinburgh also notched crucial wins away from home.
Scarlets 30-17 Cardiff Blues
The champions were full value for this victory as they dominated for large periods and eventually outscored the Blues four tries to two.
The opening exchanges were fairly even and the sides were level at 3-3 by the seventh minute after Leigh Halfpenny and Jarrod Evans traded penalties.
Scarlets pulled away when Hadleigh Parkes crossed for the opening try before Halfpenny added another penalty for the hosts in the 15th minute.