Arsenal booked their place in the fourth round of the FA Cup thanks to extra-time goals from Emile Smith Rowe and Pierre-Emerick Aubameyang.
It was not a pretty start to the defense of the Cup for the holders and most successful club in the history of the competition. Mikel Arteta handed chances to the likes of Willian, Nicolas Pepe, and Joe Willock, all of whom underwhelmed.
The Gunners lost Gabriel Martinelli to a rolled ankle in the warm-up and the Brazilian was replaced by Reiss Nelson in the starting XI.
READ: Arsenal's Gabriel Martinelli injured in warm-up ahead of Newcastle FA Cup tie
Steve Bruce's Newcastle sat deep and frustrated but had some fine chances to win it in normal time, Andy Carroll missing a glaring chance before being denied by Bernd Leno in injury of normal time.
Arsenal youngster Smith Rowe was shown a red card seconds after Leno forced extra time with his save, only for the decision to be reviewed and correctly reduced to a yellow after consulting the VAR screen. It was a decision that would go on to seal the third round tie.
Smith Rowe won possession high up and laid off to Bukayo Saka, the winger lifted the ball towards Alexandre Lacazette who, tussling with Isaac Hayden, nodded the ball back into the path of the goalscorer. The ever-impressive Smith Rowe brought the ball down on his chest and dispatched a brilliant finish into the far corner.
Newcastle had put up such brilliant resistance but were shattered by the goal and soon Arsenal doubled their lead, Kieran Tierney racing in behind before cutting back for Aubameyang who, even in this season of struggles, couldn't miss the tap in.