Shortly after lighting up the European Championship, two of the world’s most exciting young players shone on club football’s biggest stage.

Teenager Lamine Yamal’s goal couldn’t prevent 10-man Barcelona from falling to a 2-1 defeat at Monaco on Thursday in the Champions League — ending the Spanish club’s perfect start to the season.

Meanwhile, it took Florian Wirtz less than five minutes to score his first Champions League goal on his debut in Europe’s elite club competition.

Wirtz also netted another as Bayer Leverkusen romped to a 4-0 win at Feyenoord.

“I was really looking forward to this game for the last few days already, and that’s how I approached the game too. I think, however, it was like that for everyone,” Wirtz said.

“I didn’t count on finishing with two goals, but I had two chances and I just used them both. And then you can just build on that and I can just try to take my chances in every game.”

Leverkusen lost in the Europa League final in May, its only defeat in a remarkable season that saw it win the Bundesliga and German Cup.

Atalanta, the team that beat Leverkusen four months ago, had a penalty saved in a 0-0 draw with Arsenal at home.

Atlético Madrid beat Leipzig 2-1 and Benfica topped Red Star Belgrade 2-1, while Brest’s first-ever appearance in European competition ended in a 2-1 win over Sturm Graz.

It was the third evening of the new Champions League format which replaces the traditional group stage.

Now, 36 teams each play eight different opponents through January and are ranked in a single league table to decide which teams advance to the knockout phase.

Teenage superstar

Unusually, Lamal’s goal was not yet another record for the precocious 17-year-old.

Lamal boasts a number of scoring milestones for Barcelona and for Spain and became the youngest-ever scorer at the European Championship in the summer on the way to helping Spain win the tournament.

But his first Champions League goal saw him become the second youngest goalscorer in the competition, behind teammate Ansu Fati, who was 28 days younger when he netted his first goal in December 2019.

Yamal’s 28th-minute equalizer canceled out Maghnes Akliouche’s opener. And it was yet another impressive goal as Yamal cut inside from the left before placing the ball between two defenders and into the bottom right corner.

“He gave us a lot of breathing room, it was a different game at 1-1,” Barcelona midfielder Pedri said. “A great goal and I’m happy to have him.”

Barcelona had faced an uphill struggle after defender Eric Garcia was sent off with less than 11 minutes played and 18-year-old forward George Ilenikhena scored with a fine finish for Monaco in the 71st.

Barcelona hosts Young Boys on Oct. 1.

Wonderful Wirtz

Wirtz has had a great start to the season, with three goals in as many Bundesliga games.

And the 21-year-old continued that streak on Thursday in Rotterdam. Robert Andrich intercepted a poor Feyenoord pass and slipped the ball through to Wirtz, who surged forward before firing into the bottom right corner.

Leverkusen doubled its lead on the half-hour mark as Victor Boniface’s clever pass from the edge of the penalty area released Jeremie Frimpong on the right and his cross was slotted in by Alejandro Grimaldo at the far post.

Another Frimpong cross was volleyed in by Wirtz six minutes later.

Leverkusen hardly needed any help but it was given it on the stroke of halftime when a howler by Feyenoord’s German goalkeeper Timon Wellenreuther saw him turn the ball over the line following Edmond Tapsoba’s header.

Golden oldie

For all the talk of youngsters, it was a veteran who shone for Atlético.

The 33-year-old Antoine Griezmann scored for the 11th straight season in the Champions League and also put in the cross for José María Giménez’s last-gasp headed winner. Benjamin Šeško had given Leipzig the lead in the fourth minute.

Raya to the rescue

David Raya came to Arsenal’s rescue with a double save at a penalty in the 51st minute after Thomas Partey tripped Ederson.

Mateo Retegui’s spot kick was saved by the Spain international but the ball came back out to the striker, whose header was clawed off the line by a scrambling Raya.

Arsenal struggled in attack with the injured Martin Odegaard, its biggest creative force, and relied on its typically obdurate defense — and Raya — to preserve a point in Bergamo. In the next round, Arsenal hosts Paris Saint-Germain.

Fairytales

Brest’s first-ever goal in European competition was scored by midfielder Hugo Magnetti at home, but far away from its own stadium.

Brest’s stadium did not meet UEFA’s requirements and so the club’s European home games were re-located to Guingamp’s Stade de Roudourou — located roughly 114 kilometers (71 miles) away.

Brest finished a remarkable third in the French league last season. It is Sturm’s first appearance in the Champions League proper in 24 years and came after it ended Salzburg’s run of 10 consecutive Austrian titles.

Stunning goal

New Benfica coach Bruno Lage made it two wins out of two thanks to goals from Turkey internationals Kerem Aktürkoğlu and Orkun Kökçü.

Kökçü’s strike was particularly sumptuous as he curled a free kick into the top right corner from 25 yards.

Felicio Milson scored late for the home team.

Benfica welcomes Atlético to Lisbon on Oct. 2.