Argentina and Switzerland arrive at the World Cup's last 16 following wildly different journeys.
Successive victories over Bosnia-Herzegovina, Iran and Nigeria meant the Albiceleste qualified with ease at the top of Group F. Meanwhile, Switzerland were forced to down Honduras 3-0 and pray Ecuador did not triumph in a nail-biting finale with France.
However, in the knockout stages, none of those results matter. Every team in the competition must fight over the 90 minutes, and Tuesday's game in Sao Paulo will be no exception.
With Lionel Messi finding the net on a regular basis, and with Xherdan Shaqiri rediscovering his form as the tournament wears on, the following are the most fascinating matchups between the two challengers.