Gabriel Martinelli silenced his critics with a stunning hat-trick as Arsenal cruised to a 4-1 victory over Portsmouth in the FA Cup third round on Sunday. The Premier League leaders showcased their set-piece prowess at Fratton Park, overcoming an early deficit to secure their place in the fourth round.

The match began with a shock as Colby Bishop put the home side ahead within the first three minutes, threatening an upset. However, Arsenal responded swiftly, with Andre Dozzell turning the ball into his own net just five minutes later following a dangerous ball in from Eberechi Eze. The own goal served as a wake-up call for the Gunners, who then began to assert their dominance.

Martinelli then put Arsenal ahead in the 25th minute, glancing in a corner from Noni Madueke. He almost added another shortly after, hitting the post from close range. Madueke had a chance to extend Arsenal's lead before halftime but sent his penalty wide, keeping Portsmouth in the game.

Arsenal continued their momentum into the second half, with Martinelli scoring his second of the evening in the 51st minute. Gabriel Jesus delivered a low cross, which Martinelli slotted home at the far post. The Brazilian completed his hat-trick in the 72nd minute, further cementing Arsenal's lead and his own stellar performance.

Arsenal's victory was built on their effectiveness from set-pieces, scoring three goals from corners. Martinelli, in particular, displayed his aerial ability, heading in two of his goals from Madueke's corners. The win also saw the return of Kai Havertz from injury in the 69th minute and a debut for 16-year-old Marli Salmon, who became Arsenal's youngest-ever FA Cup participant when he replaced Gabriel Magalhaes in the 76th minute.

While Portsmouth, struggling in the Championship, showed glimpses of threat, they ultimately couldn't contain Arsenal's attacking quality. Madueke missed a penalty, which could have made it 3-1 in the 43rd minute. The result underlines Arsenal's strong historical record in the competition.

Martinelli's hat-trick was a fitting response to recent criticism, showcasing his finishing ability and importance to the Arsenal side. His performance, combined with Arsenal's set-piece execution, ensured a comfortable passage into the next round of the FA Cup.