Arsenal and Manchester United are on track to face each other in the Europa League final this year
The Gunners hammered Slavia Prague 4-0 on Thursday night, thanks to goals from Alexandre Lacazette (brace), Nicolas Pepe and Bukayo Saka.
They had thrown away a late advantage to draw 1-1 in the first leg.
Arsenal face Villarreal in the semi-final, a reunion with former manager, Unai Emery.
United again defeated Granada 2-0, just like they did last week.
They will play Roma for a place in the final.