London rivals Arsenal and Chelsea have celebrated quarter-final victories to move within two matches of a possible Europa League derby final.
Arsenal added a 1-0 at Napoli from Alexandre Lacacette to their 2-0 first-leg home win for a 3-0 aggregate success over the Italians on Thursday.
Chelsea scored three times in the opening 17 minutes but also survived a second-half scare as they beat Slavia Prague 4-3, with Pedro getting a brace and setting up the other two for a 5-3 aggregate win.
In the 2 May and 9 May semi-finals, Arsenal face Valencia, who won a Spanish duel against Villarreal, 5-1 from both games after 2-0 home win on Thursday night.
The 2013 champions Chelsea take on Eintracht Frankfurt, whose fairytale run continued when they overcame a 4-2 defeat in Lisbon by beating Benfica 2-0 at home after a controversial opening goal to advance on away goals.
The Baku final in Azerbaijan is on May 29.