Leinster's 21-year-old hooker Ronan Kelleher ran in a hat-trick in their thrashing of the Ospreys, while the Scarlets saw held off Glasgow.
A dramatic final day of the regular season in the Pro14 saw Glasgow Warriors make the semi-finals, while Ospreys and Scarlets will face off.
Full-back Leigh Halfpenny said constant headaches left him to consider the prospect he may have to quit at the age of 30.
Cardiff Blues used Wales Grand Slam heroes Gareth Anscombe and Josh Navidi from the start in their demolition of the Scarlets.
There will be no imminent merger of Welsh regions after it was confirmed all four will stay as they are next season.
The Scarlets have signed up Wales trio Jonathan Davies, Ken Owens and Rob Evans to new deals.
Captain Alun Wyn Jones says the Wales squad have been affected by talk of a merger between the Scarlets and the Ospreys, which is...
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The back-and-forth between the Ospreys, Scarlets and PRB continued on Wednesday, with the Swansea region alleging a "stitch-up".
The Scarlets say the Ospreys approached them last December regarding a possible merger, but the plans have been scrapped.
The Ospreys insist they are not set to merge with the Scarlets, but the Professional Rugby Board says terms for that move had been...
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A merger with Scarlets is not on the cards, Pro14 side Ospreys have insisted.
Mike James hit out at proposals for a merger with the Scarlets as the Ospreys chairman resigned from his post.
Warren Gatland wants Wales to focus on winning the Six Nations, but says talk of an Ospreys-Scarlets merger has had an impact on players.
The Scarlets ran in six tries to mark Leigh Halfpenny's long-awaited return with a 43-21 thrashing of the Cheetahs in Pro14 on Sunday.
Wales full-back Leigh Halfpenny will play for the first time since November when the Scarlets take on the Cheetahs.
Leigh Halfpenny will get the chance to prove his fitness ahead of Wales' clash with England by featuring for the Scarlets this weekend.