It's the culmination of the European rugby season with two Irish provinces in the mix.
Four-time winners Leinster face Bordeaux-Begles in the final of the Investec Champions Cup, while Ulster take on Montpellier in the Challenge Cup decider.
Both matches take place at the San Mames Stadium in Bilbao.
Find out all you need to know about the games here.
ONLINE
We'll have live blogs, reports and reaction on RTÉ.ie/sport and the RTÉ News app.
TV
Leinster v Bordeaux-Begles (Saturday, 2.45pm Irish time) and Ulster v Montpellier (Friday, 8pm Irish time) are on Premier Sports.
RADIO
Live commentary from Leinster v UBB on RTÉ Radio 1's Saturday Sport.
WEATHER
Bilbao is set for a beautiful weekend. The Friday night forecast is for sunny conditions with temperatures getting up to around 29C. Saturday is similar in the Basque Country. Temperatures are expected to be around 27C for the big one.
Leinster, looking for a fifth Champions Cup title, take on defending champions Union Bordeaux-Begles (UBB) on Saturday afternoon in Bilbao.
Both teams come into the game unbeaten in Europe this season, with the Irish province topping Pool 3 after victories over Harlequins, Leicester, La Rochelle and Bayonne.
In the knockout stages they saw off Edinburgh (49-31), Sale (43-13) and Toulon (29-25) in the semi-final.
Yannick Bru's side, meanwhile, emerged as winners of Pool 4, beating the Bulls, Scarlets, Northampton and Bristol.
They recorded wins over Leicester (64-14) and Toulouse (30-15) before accounting for Bath (38-26) in the semi-final.
Leo Cullen's side won the tournament in 2009, 2011, 2012 and 2018, beating Racing 92 in the final at the same venue on that occasion.
Since then they have lost four finals, to Saracens (2019), La Rochelle (2022, 2023) and Toulouse (2024).
UBB, who were formed in 2006 with the merger of Stade Bordelais and Club Athlétique Bordeaux-Bègles Gironde, qualified for their first Champion Cup final last year and beat Saints 28-20 in Cardiff.
Currently fifth in the table, they have lost the last two Top 14 finals, both times to Toulouse.
Defending champions Leinster, meanwhile, finished their URC regular season in second place.
Out-half Harry Byrne is the top points scorer for Leinster with 63, while winger Tommy O'Brien has four tries.
Scrum-half Maxime Lucu has scored 50 points for UBB, with France wing Louis Bielle-Biarrey the competition's top try-scorer with eight.
The sides have met twice previously in European competition, with Leinster winning the home game 9-3 in October 1998, and the club then known as simply Bordeaux gaining revenge in the return tie, 31-10, later that month.
The French side are seven point favourites with the bookmakers.
Leinster are without the injured Ryan Baird, Jack Boyle, Will Connors, RG Snyman, Charlie Tector and Hugh Cooney.
Former Leinster out-half Joey Carbery, centres Rohan Janse van Rensburg and Nicolas Depoortere are unavailable for UBB.
WHAT THEY SAID
Leo Cullen (Leinster head coach): "You want to put yourself in these situations. We've had disappointing days and all the rest, but you still want to keep putting yourself in that situation because it's an amazing way to test yourselves as a group.
Maxime Lucu (UBB scrum-half): "A second title would mean extending the club's history even further. Last year, we were so happy and we just didn’t want it to end."
Teams: Midday
Referee: Karl Dickson (Eng)
Ulster make their first appearance in the Challenge Cup final as they take on two-time winners Montpellier at the San Mames.
Richie Murphy's side beat Racing 92 in their opening Pool 3 try before losing at Cardiff. They were awarded at 28-0 walkover against Cheetahs when their match in Amsterdam was called off late due to an unplayable pitch.
They finished their campaign with a win over Stade Francais that saw them top the table.
Ulster beat Ospreys (28-24), La Rochelle (41-24) and Exeter (29-12) in the semi-final.
Montpellier Herault Rugby beat Black Lion, Zebre, Connacht and Ospreys to win Pool 1, while they knocked Perpignan (53-13), Connacht (45-22) and Dragons (18-12) out.
The French side, who won this tournament in 2016 and 2021, are currently second in the Top 14.
Ulster, the 1999 Heineken Cup winners, finished outside the URC play-off places in ninth and need to win the final in order to return to the Champions Cup next season.
Missing the injured Rob Herring, Stuart McCloskey and Jacob Stockdale, and the suspended Iain Henderson, Ulster start the game as seven-point underdogs, but wing Robert Baloucoune makes a welcome return.
Melvyn Rates and Alex Masibaka of Montpellier, and Ulster's Zack Ward have all scored four tries in the tournament to date.
The teams have met just once before, Ulster winning 40-17 away in April 2024.
WHAT THEY SAID
Richie Murphy (Ulster head coach): "With the rugby that we've played throughout the season, I think we feel like we’ve a little bit of unfinished business and maybe we can try and do something special this Friday."
Joan Caudullo (Montpellier head coach): "The players can write a new chapter in the club's history. The players surprise us every day, we're moving forward and, unfortunately, now we can't hide anymore."
Ulster: Mike Lowry; Robert Baloucoune, James Hume, Jude Postlethwaite, Zac Ward; Jack Murphy, Nathan Doak; Angus Bell, Tom Stewart, Tom O'Toole; Harry Sheridan, Cormac Izuchukwu; Dave McCann, Nick Timoney (capt), Juarno Augustus.
Replacements: James McCormick, Eric O'Sullivan, Scott Wilson, Charlie Irvine, Bryn Ward, Conor McKee, Jake Flannery, Ethan McIlroy.
Montpellier: Tom Banks; Gabriel N'Gandebe, Arthur Vincent, Auguste Cadot, Donovan Taofifenua; Domingo Miotti, Ali Price; Enzo Forletta, Jordan Uelese, Mohamed Haouas; Florian Verhaeghe, Tyler Duguid; Lenni Nouchi, Alex Becognee, Billy Vunipola (capt).
Replacements: Lyam Akrab, Baptiste Erdocio, Wilfrid Hounkpatin, Adam Beard, Marco Tauleigne, Leo Coly, Thomas Darmon, Jon Echegaray.
Referee: Matthew Carley (Eng)
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