The Ospreys claimed only their second Pro14 win over the season at the expense of high-flying Ulster in a stormy Swansea.
It was a record-breaking outing for Munster in Pro14 action on Friday, while Glasgow Warriors were also big winners.
With Brad Mooar heading off to be part of New Zealand's coaching staff, Glenn Delaney will take over as head coach of the Scarlets.
Ireland's James Ryan is hungry for more honours with club and country after signing a new deal.
Ahead of crunch Six Nations matches with Wales and England, Ireland were dealt a blow with Garry Ringrose ruled out.
Joseph Dweba crossed twice as the Cheetahs ran in seven tries to beat Southern Kings again, albeit this time in emphatic fashion.
Rhyno Smith scored twice in the closing stages against Southern Kings to again secure the bragging rights for the Cheetahs.
Steff Evans was linked with a move to the Top 14, but the Wales flyer has decided to remain with his home region.
Joey Carbery has suffered another injury blow and will play no part in Ireland's bid to regain the Six Nations title.
He may have been granted an early release by Toulon, but Rhys Webb will not play for them again if owner Bernard Lemaitre has his way.