Arsenal secured what manager Mikel Arteta called an "important win in a crucial moment" as they impressively swept aside Slavia Prague to reach the Europa League semi-finals.
The Gunners produced one of their best performances of the campaign to turn a potentially difficult night into a fine away victory.
With the tie evenly poised at 1-1, they scored three goals in the opening 24 minutes and had another ruled out by the video assistant referee - all-but ending the contest in the opening period.
It kept alive their hopes winning the competition - and with it their only realistic chance of European football next season.