Can Gunners breach Simeone's fortress?

Atletico Madrid return to the Metropolitano seeking a response to their Copa del Rey final loss to Athletic Bilbao last week as Diego Simeone’s side host Mikel Arteta’s Arsenal in the first leg of their Champions League semifinal tonight. Arsenal arrive amid a fierce Premier League title push, chasing their first league crown since 2003-04 and a first major trophy in six years.

**Both sides are still hunting a first European crown despite long runs in the competition. Arsenal have played 223 European Cup/Champions League matches without winning it (the most), with Atletico next on 190.

**They have already met this season, with Arsenal cruising to a 4-0 win in the league phase last October – matching Atletico’s joint-heaviest defeat in the competition. Their only previous knockout tie came in the 2017-18 Europa League semifinals, when Atletico progressed 2-1 on aggregate.

**At home, however, Atletico are unbeaten in Champions League knockout matches against English clubs (P6 W3 D3), each against different teams, though none against Arsenal.

**Arsenal are in strong European form, one game shy of equalling their longest unbeaten run in the competition (10 wins, two draws in their last 12).

**Antoine Griezmann has been involved in 24.2% of Atletico’s Champions League goals (56/231 – 40 goals, 16 assists), the highest share by any player for a team with 100+ goals, just ahead of Lionel Messi’s 24.1% for Barcelona.

**Julian Alvarez has also starred, with nine goals – the most by an Atletico player in a single European Cup/Champions League campaign.