Leinster maintained their phenomenal 100 per cent Pro14 record by grinding out a 13-6 derby victory at Munster and Edinburgh beat Glasgow Warriors on Saturday.
The defending champions put on a defensive masterclass at Thomond Park to make it nine wins from nine in the competition.
Leinster held off a bright start from Munster to score through Ed Byrne from their first real attack of note.
Ross Byrne added the extras and split the posts again to make it 10-0 after 22 minutes, with JJ Hanrahan getting Munster on the board shortly before the break.
Hanrahan nailed another penalty early in the second half, but for all their endeavour, Munster could not find a way through a stoic Leinster defence.
Edinburgh - second in Conference B - overcame Glasgow 29-19 to keep alive their hopes of winning the 1872 Cup – contested annually between the Scottish rivals – for a third straight year, having lost to the same opponents a week ago.
Darcy Graham scored twice for Edinburgh, who were twice behind after the break due to tries from Scott Cummings and George Horne.
Benetton Treviso made it two wins over Italian rivals Zebre in the space of a week, hooker Hame Faiva scored a hat-trick in a 36-25 win despite the early sending off of Juan Ignacio Brex.