Granit Xhaka’s fine strike secured Arsenal’s second huge win in four days after beating Manchester United 3-1 in the Premier League at Emirate Stadium on Saturday.
Nuno Tavares capitalized on some poor defending to tap in the opener before Bukayo Saka converted a penalty.
Cristiano Ronaldo netted his 100th Premier League goal straight back on his return to the Manchester United side.
The visitors began the second period well and somehow failed to equalize, with Bruno Fernandes missing a penalty for the Red Devils.
Diogo Dalot hit the post but the Portuguese full-back struck the goal frame again with Manchester United’s next attack.
But Granit Xhaka’s fine strike capped off a big week for Arsenal as the victory sees the Gunners move into the fourth spot in the Premier League and three points ahead of their north London rivals Tottenham, who travel to Brentford.
Meanwhile, defeat is a catastrophic blow to Ralf Rangnick’s side’s hopes of securing Champions League football for next season