Arsenal host Atletico at the Emirates on Tuesday (3pm ET / 8pm BST); Bayern host PSG at the Allianz Arena on Wednesday (3pm ET / 8pm BST). Both ties are open. Both finalists will be confirmed by Wednesday night.
The final is in Budapest on May 30. By Wednesday night, we will know who is going.
Two second legs in forty-eight hours. One is a deeply tactical contest between two sides that have now studied each other through ninety minutes in Madrid and know exactly what the other wants to do. The other — after nine goals in Paris last Tuesday — is something different entirely.
Arsenal vs Atletico Madrid
Arsenal
Atletico MadridThe first leg in Madrid ended 1-1, both goals coming from penalties. Gyökeres put Arsenal ahead just before half-time after a foul inside the box — the call straightforward, the finish emphatic. Álvarez levelled after VAR sent the referee to the monitor for a handball by Ben White. The decision was debatable from the outset: the ball struck White's leg before deflecting onto his arm, his body was falling so the arm position was entirely natural, and the ball was going nowhere near the goal. Then came the more contentious moment — a third penalty given for a foul on Eze, then reversed on review. There was contact. Outside the box it would have been a foul, possibly a booking. Whether it crossed the threshold of a clear and obvious error is not obvious.
xG values ×10 for visual comparison. Atletico's xG (2.22) reflects their uncharacteristically attacking approach on home soil — higher than Arsenal's (1.51), though the open-play chance quality was more balanced than the aggregate suggests.
The game was largely even. Atletico were uncharacteristically open — Simeone's side pushed higher and attacked with more urgency than they typically permit themselves, presumably emboldened by playing at home. That openness created space, and Arsenal used it. A 1-1 scoreline that looks balanced actually understates how close Arsenal came to leaving Madrid with a lead.
The tactical question on Tuesday is whether Simeone reverts to form — sitting deeper, compressing space, letting Arsenal have the ball and waiting to punish a mistake on the transition. At the Metropolitano with his own crowd, he attacked. At the Emirates against sixty thousand who already have views on at least two of last week's VAR decisions, he may set up differently. That version of Atletico — organized, compact, dangerous on the break — is the genuinely difficult one to unlock.
Watch Saka. He started Saturday's win over Fulham and was one of the more dangerous players on the pitch for the hour or so he played — direct, winning duels, and looking back to the level that made him irreplaceable before his form dipped this season. Trossard also looks to be finding his rhythm. If both are sharp, Arsenal have the width and penetration to stretch whatever shape Atletico set.
There is also the question of Arteta's midfield. The combination he fielded against Fulham was arguably the most functionally complete Arsenal midfield of the season — fluid, high-energy, and clearly on the right side of fit. Whether he trusts that selection for the semi-final, or reverts to Zubimendi — who has been visibly carrying fatigue over the past month — may determine how much Arsenal can control the game rather than merely react to it.
Arsenal have been to one Champions League final, in 2006. Last season PSG ended their run in the semis. This is the second consecutive semi-final, and they come into it with the home leg.
Bayern Munich vs PSG
Bayern Munich
PSGPSG won the first leg 5-4 in the highest-scoring semi-final in the Champions League era. Kane gave Bayern the lead from the spot. PSG equalized through Kvaratskhelia, then went ahead through Neves. Olise pulled it back to 2-2. Dembélé's penalty before half-time had PSG ahead at the break. Two more goals in the opening ten minutes of the second half — Kvaratskhelia again, then Dembélé — had the reigning champions 5-2 up. Bayern refused to fold: Upamecano and Díaz scored in three minutes to make it 5-4, and the first leg ended with the tie very much alive.
Bayern dominated the ball and came away with four goals. PSG had the transitions and won the game. The second leg figures to look similar — just in reverse.
PSG lead on aggregate. To advance in ninety minutes, Bayern need to win by two or more clear goals. A draw advances PSG. The math is Bayern's problem, but it should be noted: PSG are not a team that sits on leads and grinds. They scored four times in the second leg of their quarter-final. The idea of this PSG side absorbing pressure in Munich and keeping it scoreless is inconsistent with what this team actually does.
This is part two of one of the most open, chaotic, and entertaining matches played in this competition this decade. Bayern have had a week to process the fact that they blew a lead twice, conceded five, and still came out of Paris feeling the tie is alive. That is not a team with a confidence problem. Kompany has won the Bundesliga in his first full season and broken records at the club.
The question is not belief. The question is whether the Allianz can generate what the Parc des Princes generated — an atmosphere that produces something beyond what either team could manufacture on a quieter night. Kane has scored in six consecutive Champions League knockout matches — matching Cristiano Ronaldo's record. The crowd will find him early. If Bayern score in the first twenty minutes, the dynamic shifts entirely, and PSG — who play well in chaos but can also be run down — will face the kind of pressure that makes these nights unpredictable.
The most likely outcome is that this tie is not decided in ninety minutes. Both teams are too open, too attack-minded, and too evenly matched for a clean result at the end of regulation. Extra time feels like the natural destination for a tie that started with nine goals.
Both Ties, One Week
Two second legs that arrived at their current state by completely different routes. Arsenal and Atletico cancelled each other out in a tight first leg where the margin between a comfortable Arsenal lead and a 1-1 draw came down to three penalty decisions. Bayern and PSG produced nine goals and left the aggregate closer than the football suggested it deserved to be.
What they share: neither tie has a clear frontrunner. A home win in each case is entirely plausible. An upset in each case is too. By Wednesday night, we will have two finalists for Budapest — and there is a reasonable argument that any combination of these four clubs deserves to be there.
Forty-eight hours to find out which two.
Arsenal vs Atletico: Tuesday May 5 · 3:00pm ET / 8:00pm BST · CBS / Paramount+
Bayern vs PSG: Wednesday May 6 · 3:00pm ET / 8:00pm BST · CBS / Paramount+