Antoine Griezmann's strike eight minutes from time earned 10-man Atletico Madrid a 1-1 draw against Arsenal in the Europa League semi-final first leg at the Emirates
Alexandre Lacazette's third goal in as many games in the competition gave Arsene Wenger's side the lead after Sime Vrsaljko had been sent off, but poor defending allowed Griezmann to score a vital away goal on the counter-attack
Atletico, who also had manager Diego Simeone sent to the stands moments after Vrsaljko's dismissal, will be strong favourites to reach the final heading into the second leg at the Wanda Metropolitano next Thursday
Arsenal, who dominated the ball throughout the evening, came close to recovering from Griezmann's late intervention but Jan Oblak sprung to his right to dramatically keep out Aaron Ramsey's header
Arsenal made much the brighter start in what was Wenger's final European home game and the hosts should have been ahead inside six minutes when Lacazette was picked out by Danny Welbeck, but the Frenchman volleyed wide and Oblak made a point-blank save from the striker's header moments later
Atletico were reduced to 10 men when Vrsaljko - already on a booking for a foul on Jack Wilshere after 75 seconds - was shown his second caution for catching Lacazette on the ankle
With Simeone ushered to the stands after protesting that Hector Bellerin should have been booked, the Gunners were denied again as Oblak spread his legs to thwart Welbeck before Griezmann fired two warning signs in quick succession
The lethal Frenchman, who has now scored 14 goals in his last 14 games, forced David Ospina into two smart saves but an eventful first 45 minutes came to an end goalless
The second period was a much tighter affair, with Atletico defending resolutely until Lacazette found the breakthrough on the hour-mark from Wilshere's deep hanging cross
The former Lyon striker rose above Lucas at the far post to head into the ground and past Oblak after Wilshere reached the byline following a swift give-and-go with Ramsey
Arsenal hoped that would be the start of the floodgates opening, but Atletico stood firm as Lacazette's header from Mesut Ozil's corner flew past the far post, before the Gunners were punished for their profligacy
Laurent Koscielny failed to deal with a long ball and Griezmann pounced on the mistake, first denied by Ospina but able to dink the ball over the grounded Shkodran Mustafi on the rebound to score the all-important away goal
 "It's not about blaming individuals
 The whole team is very disappointed and down
 We created the anti-climax by giving a goal away
 I was focused on doing absolutely everything to win the game
"We played the favourites out of the four teams left, and I thought we started well with good pace and good collective drive
 The whole thing went wrong in the end, but I don't have much time to get rest
" "It's tough to know what to say
 The ref decided to send off Vrsaljko and I thought an Arsenal player should have got a booking
 When I protested he sent me off
"To be honest it was 90 minutes in which my body was full of strong emotions, these players are basically heroes
"They stood firm, after a long season, for 80 minutes in a tremendous way
 I have goosebumps thinking about the next match
"Arsenal let their opponents escape with an unlikely away goal and without a deficit to make up in Madrid and while the hosts showed a lack of nous, Atletico had it in abundance thanks to their defensive stalwart Diego Godin
The experienced centre-back will be confident of reaching the final now having marshalled a defence to clean sheets in each of their last 11 home games, and after seeing team-mate Vrsaljiko dismissed early, Arsenal were reduced to few chances in the second half
Godin helped rearrange the back-line following that early setback, and while the Spanish side rode their luck at times, it was another vintage, resolute performance from the veteran Uruguayan
Arsenal travel to take on Manchester United on Super Sunday, live on  and 
Atletico Madrid return to La Liga action on Sunday against Alaves, live on 
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