Chelsea and Arsenal will meet in the Europa League's showpiece event on May 29. We look at their route to the Baku final.
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Willian struck early from a Ross Barkley lay-off to get Chelsea's campaign in Group L off to a winning start in Greece.
Alvaro Morata scored the only goal after 70 minutes as the Blues finally wore down the stubborn Hungarian champions.
Ruben Loftus-Cheek scored a superb hat-trick - his opening two goals coming in the first eight minutes - as Maurizio Sarri's side cruised to victory.
Chelsea secured their place in the knockout stages as Olivier Giroud scored his first goal in six months early in the second half in Belarus.
Giroud grabbed two in the first half and Callum Hudson-Odoi and Morata netted after the break in a convincing victory over PAOK, who had Yevhen Khacheridi sent off in the seventh minute.
Chelsea, who made 10 changes for what was a dead rubber, came from behind to claim a draw with an equaliser from Giroud, Willian having earlier opened the scoring.
Goals from Barkley and Giroud put Chelsea in control but a late reply from Anders Christiansen gave the Swedish side hope ahead of the second leg.
After a slow start, Chelsea wrapped up a 5-1 aggregate win with second-half strikes from Giroud, Barkley and Hudson-Odoi while Malmo finished with 10 men after the dismissal of Rasmus Bengtsson.
Chelsea put one foot in the last eight with a comfortable win at Stamford Bridge, the goals coming from Pedro, Willian and Hudson-Odoi.
Giroud hit a hat-trick and further goals came from Marcos Alonso and Hudson-Odoi as Chelsea powered through 8-0 on aggregate.
Alonso struck four minutes from time as Chelsea snatched the advantage after a tough encounter in the Czech Republic.
Chelsea struck four times in the first 27 minutes to seemingly put the tie to bed with a Pedro double, a Giroud effort and an own goal. Two stunning Petr Sevcik strikes after the break, adding to Tomas Soucek's earlier header, made for a nervy finish but the Blues prevailed 5-3 on aggregate.
Pedro scored the equaliser as Chelsea replied to Luka Jovic's strike to claim a draw in Germany.
Chelsea needed penalties to reach the final after Jovic cancelled out a Loftus-Cheek goal. Eden Hazard scored the decisive spot-kick in what could have been his final appearance at Stamford Bridge after Kepa Arrizabalaga made two saves.
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Pierre-Emerick Aubameyang scored in either half for a much-changed Arsenal side in Unai Emery's first European game as Gunners head coach. Danny Welbeck and Mesut Ozil also netted.
Arsenal got a taste of Baku as they travelled for their first away game of Group E. The scoreline flattered the visitors as Sokratis Papastathopoulos, Emile Smith Rowe and Matteo Guendouzi all scored their first goals for the club.
Danny Welbeck scored the only goal in the Portuguese capital as Arsenal extended their winning streak across all competitions to 11 games. The England international had already had a header chalked off for a foul.
A goalless draw back at the Emirates Stadium sealed Arsenal's place in the knockout rounds - but was overshadowed by Welbeck suffering a broken ankle which meant it would prove to be his final game for Arsenal. Sporting had Jeremy Mathieu sent off for scything down Aubameyang.
Top spot in Group E was secured in a matched switched at short notice to Kiev, 185 miles east of Poltava, with parts of Ukraine under martial law due to political tensions with Russia. Smith Rowe and Joe Willock scored either side of an Aaron Ramsey penalty.
A dead rubber allowed Emery to welcome captain Laurent Koscielny back from long-term injury in a game settled by Alexandre Lacazette's goal.
Having thrashed BATE in Belarus during last season's group stage, Arsenal were shocked to leave the Borisov Arena with a first-leg deficit. Stanislav Dragun's header on the stroke of half-time earned the hosts a famous win as Lacazette was sent off late on.
Arsenal soon redressed the balance in a second leg which saw Aleksandr Hleb return to the Emirates Stadium. A fourth-minute Zakhar Volkov own goal levelled the tie before headers from defensive duo Shkodran Mustafi and Sokratis booked a place in the last 16.
More away-day blues greeted Emery in north-west France, despite Alex Iwobi giving Arsenal an early lead at Roazhon Park. Sokratis was sent off in the first half for two yellow cards as Benjamin Bourigeaud levelled with a fine strike before Nacho Monreal's own goal and a late Ismaila Sarr header.
Once again, Arsenal bounced back in front of their own fans as Aubameyang hit a brace and Ainsley Maitland-Niles scored just his second Arsenal goal to seal a narrow aggregate victory.
Carlo Ancelotti's Napoli were expected to give Arsenal their toughest test to date but the Gunners were too good. Ramsey hit his last ever Emirates Stadium goal before a Kalidou Koulibaly own goal gave them a stronger lead.
A Lacazette free-kick was enough to secure a rare away win and seal progression into a second successive Europa League semi-final - Emery showing the nous which saw him lift three Europa League titles in a row with Sevilla.
Another of Emery's former clubs was waiting for Arsenal in the last four, with Valencia taking the lead through Mouctar Diakhaby's header. Arsenal had their deadly frontline to thank for turning the tie around as Lacazette scored a first-half brace before Aubameyang added a third in the final minute.
Kevin Gameiro's goal gave Valencia some hope of an unlikely comeback but Aubameyang hit a hat-trick, with Lacazette again on the scoresheet as even a second Gameiro effort after the break was nowhere near enough for Valencia.