Ulster continue their push for a place in the Pro12 play-offs with a 27-17 victory over Newport Gwent Dragons at Rodney Parade.
Gloucester earn a bonus-point win at Bristol to keep the Premiership's bottom club seven points adrift of Worcester.
The Six Nations will be played over six weeks, reduced from seven, under plans by the Rugby Football Union.
A late try by substitute John Andrew edged stuttering 14-man Ulster to victory over a battling Newport Gwent Dragons side.
Wales fly-half Rhys Patchell scored two tries within thirty minutes of his return after three months out injured as the Scarlets beat Edinburgh 26-10.
Wales legend Shane Williams one game away from Principality Stadium final after being named on bench by Amman United.
Lyon prop Sami Mavinga can be a "destructive" signing for Newcastle Falcons, says director of rugby Dean Richards.
Previews and team news for this weekend's 12 matches in the Premiership & Pro12.
Rob Kearney and Jamie Heaslip's chances of being in the British and Irish Lions squad are placed in doubt as both have minor surgery.
Scotland players Stuart Hogg, Ali Price and Finn Russell return to the Glasgow Warriors line-up to face Connacht on Saturday in the Pro12.
Team details and match preview as bottom club Zebre host third-placed Munster in the Pro12 on Saturday.
Team news as Northampton host Leicester Tigers in Saturday's Premiership fixture at Franklin's Gardens (15:00 GMT).
Team news as Wasps host Worcester in Sunday's Premiership fixture at the Ricoh Arena (14:30 BST).
Team news as Harlequins host Newcastle Falcons in Saturday's Premiership fixture at Twickenham Stoop (15:00 GMT).
Team news as Exeter host Sale in Saturday's Premiership fixture at Sandy Park (15:00 GMT).
Team news as Saracens host Bath in Sunday's Premiership fixture at Allianz Park (15:00 BST).
Team details and match preview as Pro12 leaders Leinster host eighth-place Cardiff Blues in Dublin on Saturday.
Team details and match preview as the Ospreys travel to Italy looking to keep the pressure on Leinster at the top of the table.
This week's sport on the BBC includes international football, BBL Championship basketball and the return of Formula 1.
Wales' Test match against Tonga will take place in Auckland the day before the Lions tourists face Maori All Blacks.