The clash at Jan Breydelstadion started in the best way possible for Unai Emery's band after Leon Bailey gave the lead following a set-piece play in the third minute of the game.
The Gunners have failed to recruit a striker in recent transfer windows, with Kai Havertz having operated as the spearhead in their attack for the majority of the season, until he suffered an injury.
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Merino stuck away Arsenal's third goal at the Philips Stadion on Tuesday night as they ran riot in the Champions League.
Arsenal earned a dominant 7-1 victory away against PSV Eindhoven to effectively seal their place in the Champions League quarter-finals. Mail Sport's Isaan Khan rates the players.
EXCLUSIVE BY CRAIG HOPE: Newcastle defender Lewis Hall will miss the Carabao Cup final in yet another blow for Eddie Howe, Mail Sport can reveal.
Mikel Merino's goal to make it 3-0 to Arsenal during their humiliating rout of PSV shouldn't have stood according to Wayne Rooney and Theo Walcott.
PSV 1-7 ARSENAL: Mikel Arteta's side recorded a record-breaking Champions League after annihilating their dismal Dutch opponents.
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Snooker fans at the World Grand Prix were forced to leave the venue while a match was being played.
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