Sokratis Papastathopoulos and Eddie Nketiah were on target as Arsenal battled for a 2-0 win at League One Portsmouth that booked their place in the FA Cup quarter-finals.
The Gunners survived some nervy moments to take an undeserved lead into the break at a noisy Fratton Park thanks to Sokratis' well-taken goal in first-half injury time.
Nketiah then scored for the third time since returning from a loan spell at Leeds United in January early in a far more comfortable second half to end any hopes of an upset from a game Pompey side.