Five games, five clean sheets, two completely different competitions. Argentina have done it in International Friendly Games, Atlético Nacional have done it in Copa Colombia, and between them they represent the most airtight defensive runs going right now.
Argentina: barely a sniff
Argentina's run is the more remarkable on paper. Across five friendlies they have conceded at a rate of just 0.06 expected goals per game, a number that suggests opponents have barely managed to create anything of note. Five clean sheets without the underlying chances to even threaten one is a different level of control.
Atlético Nacional: shutting the door under more pressure
Atlético Nacional's five clean sheets in Copa Colombia have come against a backdrop of 0.19 xG conceded per game, roughly three times Argentina's figure. That is still a stingy number by any measure, but it points to a defence that has had to actually defend rather than simply watch the game happen at the other end. Keeping the ball out of the net five times running while facing real chances arguably takes a different kind of discipline than doing it almost by default.
The common thread
What links the two is consistency rather than circumstance. Neither side has needed a moment of individual brilliance to protect a scoreline, both have just repeated the same result long enough that it stops looking like a streak and starts looking like a method. Whether that holds depends on what comes next: for Argentina, sterner opposition than recent friendlies have offered would be the real examination; for Atlético Nacional, Copa Colombia will keep testing whether 0.19 xG conceded per game is a floor or a temporary dip.
For now, both occupy the same rare space: five matches, five shutouts, and defences that opposing attackers have had almost nothing to say about.