Arsenal cruised into the FA Cup fourth round with a 4-1 victory over Portsmouth, but the scoreline didn't tell the whole story. Match of the Day analysis revealed the Gunners' dominance came from clever set pieces. Portsmouth struggled to cope with Arsenal's movement on corners and free kicks, leaving gaps that the London side exploited for key goals throughout the comfortable win.

This victory continues a strong trend for Arsenal, who have become masters of scoring from dead-ball situations under their current coaching staff. For Portsmouth, a side fighting in League One, the defeat exposed the massive gap to Premier League quality, especially in defensive organization during set plays. It was a harsh lesson in the importance of details at the highest level of the FA Cup.

Arsenal now advance to face a fellow top-flight opponent in the next round, where they'll hope to continue their cup run. Meanwhile, Portsmouth must return to their league campaign knowing their defensive work on the training ground needs immediate attention. The match proved that even in a comfortable win, the tactical battle between set-piece specialists and their markers remains a defining part of modern football.