Ramsey opens scoring for Gunners, Torreira shot deflects in off Koulibaly
Alonso heads in for Chelsea with five mins to go in Prague
Hazard & Kante come off bench for Blues in second half
Benfica beat Eintracht Frankfurt & Valencia win at Villarreal in other ties
Marcos Alonso
Like to say it was coming, but it wasn't.
Willian, perhaps Chelsea's biggest attacking threat at the Eden Arena, delivers a pinpoint ball for Marcos Alonso who stoops to head in from about six yards out.
Huge away goal for the Blues.
Image source, Reuters
Arsenal 2-0 Napoli
Get rid now!! Kidding obviously.
But Aaron Ramsey, who has been outstanding again, misses what he would class as a sitter from about eight yards after being set up by sub Henrikh Mkhitaryan.
It was terrible, tbf.
Image source, EPAThe 10 men of Eintracht Frankfurt are not going away!
Substitute and former Porto forward Goncalo Paciencia has clawed a goal back for the Germans against Benfica.
It's 4-2 with around 10 minutes remaining in Lisbon.
Image source, Getty ImagesSlavia Prague 0-0 Chelsea
At one end Jorginho has the ball in the net but it's ruled out for offside and at the other end Kepa Arrizabalaga makes a stunning save to keep out Jan Boril's superb half volley.
Image source, Rex FeaturesArsenal 2-0 Napoli
Goalscorer Lucas Torreira is replaced by Mohamed Elneny.
Ah, hang on folks. The goal has now been given as a Kalidou Koulibaly og.
Sorry Lucas.
Arsenal 2-0 Napoli
Another lovely Arsenal move sees Aaron Ramsey backheel a pass into the path on the galloping Sead Kolasinac.
The Bosnia elects to shoot instead of pass, and his strike is saved low by Alex Meret, who it's fair to say has had a decent workout.
Image source, Getty ImagesArsenal 2-0 Napoli
Lorenzo Insigne, who this time times his run correctly instead of being caught offside, plays a square ball from the right for the fast-arriving Piotr Zielinski, who pokes his shot over the bar.
Should the Napoli man have gone with his right foot?
It was a bad miss.
Image source, ReutersArsenal 2-0 Napoli
Sead Kolasinac, one of Arsenal's best players this season, charges down the left and fires in a cross that Alex Meret manages to get his gloves to.
The ball lands at the feet of Ainsley Maitland-Niles, whose bouncing bomb of a shot is spectacularly tipped away by the Napoli keeper.
Image source, ReutersSlavia Prague 0-0 Chelsea
Kepa Arrizabalaga makes his first big save of the match to prevent a thunderous drive from Ibrahim Traore from making a hole in the netting.
Will Slavia sneak a winner?
Image source, Getty ImagesArsenal 2-0 Napoli
More Arsenal-type substitutions.
Mesut Ozil and Alexandre Lacazette are replaced by Alex Iwobi and Henrikh Mkhitaryan.
Image source, Getty ImagesFrancis Coquelin has come on as a substitute for Valencia.
With former Gunners team-mate Santi Cazorla also on the pitch for Villarreal, there's a healthy Arsenal interest in the all La-Liga quarter-final.
It's still 1-1 with around 20 minutes left.
Image source, ReutersArsenal 2-0 Napoli
Arkadiusz Milik, Napoli's top scorer, comes on for Dries Mertens.
Arsenal 2-0 Napoli
Henrikh Mkhitaryan and Alex Iwobi are pulling their socks up - which means they are about to come on.
Meanwhile, Alexandre Lacazette is a fraction offside as he launches an angled shot which is saved by the feet of Alex Meret.
Image source, Getty ImagesArsenal 2-0 Napoli
Aaron Ramsey's Kieron Pollard-six of a shot is pushed away by keeper Alex Meret, whose hands remain attached to his arms.
How Arsenal will miss the Welshman.
Image source, ReutersAre Benfica heading into the semis?
Two goals in four minutes by Ruben Dias and Joao Felix makes it 4-1 against 10-man Eintracht Frankfurt with more than half an hour remaining in Lisbon.
What a night for Felix.
The 19-year-old has bagged a hat-trick.
Image source, ReutersSlavia Prague 0-0 Chelsea
A corner from the right pretty much hits Olivier Giroud in the six-yard area and eventually goes out for another corner.
From that corner, Antonio Rudiger's excellent low strike is met by an equally excellent save with his foot by Ondrej Kolar.
Chances at the Emirates too....
Image source, ReutersSlavia Prague 0-0 Chelsea
Hazard comes on for Pedro.
Chelsea fans' hopes are raised.
Image source, Rex FeaturesSlavia Prague 0-0 Chelsea
Eden Hazard is about come on for Chelsea...
Arsenal 2-0 Napoli
Napoli skipper Lorenzo Insigne slots the ball in but he's miles offside - no need for VAR, which is a good thing because there is no VAR.
Moments later, Kalidou Koulibaly's header from a corner flies over the bar via a Petr Cech fingertip.
Nothing comes from the second corner.
Image source, Rex Features
Image source, EPAArsenal 2-0 Napoli
Napoli's players must have had a couple of coffees (no milk) at half-time - they're must more spritely at the start of this half than they were in the whole of the first.