Three time European Champions Leinster Rugby play Scarlets at the Aviva Stadium on Saturday afternoon in their 10th semi-final appearance in the competition.
Both of these semi-finalists have met seven times previously in the European Cup with Leinster winning five of those matches including the last four in a row.
Only one of Leinster’s previous nine semi-finals have been against Welsh opposition, against Cardiff, in the 1995-96 Champions Cup when the Welsh side won.
Leo Cullen’s side is the only team with a 100% winning record in this season’s Champions Cup and could become only the second club after Saracens in 2015-16 to win every match in a campaign
No side has averaged more tries per game than Leinster this season (3.6, same as Saracens), whilst the province has conceded the fewest penalties per match (7.6).
Scarlets are at this stage of the Champions Cup for the first time since 2006-07 and for the fourth time overall, but they have yet to progress to the final of the competition.
The Scarlets have won 94% of their own lineouts in this campaign, the best rate of any side.
Munster Rugby-bound Scarlets player Tadhg Beirne has won five more turnovers (16) than any other player this season.
Referee for this weekend’s first Champions Cup semi-final is Romain Poite, assisted by his fellow Frenchmen Mathieu Raynal and Pierre Brousset.