Argentina's 3-1 victory was a masterclass in controlled dominance, punctuated by individual brilliance. Scaloni's 4-3-3 gave Mac Allister and Enzo Fernández the freedom to dictate tempo from deep, while Messi's inverted role from the right created constant overloads in Algeria's left half-space. Algeria's 4-2-3-1 was well-organized in the first half, with Zerrouki and Boudaoui forming a disciplined double pivot, but the midfield pairing was consistently bypassed by Argentina's third-man combinations. The introduction of Mahrez at half-time was Algeria's most dangerous tactical move — his directness and ability to win the penalty demonstrated why he remains their talisman — but Argentina's depth proved decisive. Lautaro's cameo sealed the points and underlined Argentina's squad quality beyond their superstar. The result confirms Argentina as heavy Group J favourites and sends an early warning to the rest of the tournament field.

• Messi's free-kick in the 18th minute was his 98th international goal — the perfect Group J opener.
• Argentina's xG of 2.91 vs Algeria's 0.97 underlines the gulf in class between the sides.
• Mahrez's penalty was Algeria's first shot on target — a reminder of their counter-attacking threat.
• Mac Allister completed 94 of 107 passes (88% accuracy) and created 3 key chances, the most of any player on the pitch.
• Lautaro Martínez scored within 9 minutes of coming on — his 5th World Cup goal across two tournaments.
• Algeria's compact mid-block held for 37 minutes but was ultimately undone by Argentina's quality in transition.
• Emiliano Martínez made 2 crucial saves in the 57th–60th minute window to keep Algeria at bay after the penalty.