Under a roaring Kansas City sun, a sold-out GEHA Field at Arrowhead Stadium witnessed Lionel Messi's World Cup farewell tour begin in the most fitting fashion — with a moment of pure, unrepeatable genius. Argentina, wearing their iconic sky-blue and white stripes, were patient in the opening quarter-hour, probing Algeria's disciplined 4-2-3-1 block with short combinations through Mac Allister and Enzo Fernández. The breakthrough arrived in the 18th minute: Ramiz Zerrouki cynically hacked down Julián Álvarez 22 yards from goal, and Messi — standing over the ball with that familiar stillness — curled a free-kick of breathtaking precision over the wall and inside Luca Zidane's left post. Arrowhead erupted.

Algeria, to their credit, refused to buckle. Houssem Aouar and Farès Chaïbi probed between the lines, and Amine Gouiri caused Lisandro Martínez problems with clever movement. But Argentina's second arrived just before the break: Messi collected a De Paul layoff on the right, slid a perfectly weighted through-ball into the channel, and Julián Álvarez — all electric energy — rounded Zidane and slotted home from a tight angle. 2-0 at the break, and the contest appeared settled.

Algeria's half-time introduction of Riyad Mahrez changed the texture of the game entirely. The Al-Ahli winger, carrying the hopes of a nation, immediately began tormenting Tagliafico down Algeria's right. In the 51st minute, Cristian Romero — already on a yellow — clumsily barged Mahrez inside the box. The referee pointed to the spot, and Mahrez himself stepped up, sending Emiliano Martínez the wrong way to make it 2-1. Suddenly, Kansas City held its breath.

Scaloni responded swiftly, introducing Lautaro Martínez for Lo Celso in the 65th minute. The Inter Milan striker needed just nine minutes to restore Argentina's two-goal cushion: Mac Allister — imperious all evening — played a perfectly timed reverse pass through Algeria's high defensive line, and Lautaro controlled, composed himself, and drove low past Zidane's near post. 3-1. Algeria's heads dropped, and Argentina saw out the final quarter-hour with the calm authority of world champions. Messi was substituted to a standing ovation in the 82nd minute, having already left his indelible mark on the tournament's opening weekend.