Striker Edward Nketiah was on target for Arsenal as they inflicted a 2-1 defeat on AFC Bournemouth to advance to the fifth round of the FA Cup.
Nigerian youngster Bukayo Saka put the Gunners ahead in the 5th minute with a close range finish.
Nketiah extended the Londoners lead on the 26th minute before Sam Surrridge scored for the Cherries in the fourth minute of second half stoppage time.
The result seals a trip to Fratton Park against Portsmouth in the fifth round.