#4 Poland vs Colombia (24 June)
Riding on the James Rodriguez wave, Colombia went far in the 2014 World Cup. The midfielder's Golden-Boot-winning heroics saw the South American side breeze through the group stages before falling to Brazil in the quarter-finals.
Poland, on the other hand, are now riding the Robert Lewandowski wave. Having top scored with 16 goals in the World Cup qualifiers, Poland topped their group with 8 wins and only a single defeat.
Having been knocked out of Euro 2016 by eventual champions Portugal only on penalties, the Poles have a point to prove. Lewandowski is not their only threat, though. They are not a one-man team.
With Wojciech Szczesny in goal, defenders Kamil Glik and Lukasz Piszczek, and midfielder Grzegorz Krychowiak, Poland have quite a capable spine.
However, Colombia have a number of stars to watch out for too. James Rodriguez is undoubtedly still their biggest but bring the likes of forwards Radamel Falcao and Carlos Bacca, defenders Davinson Sanchez and Yerry Mina, and winger Juan Cuadrado into the mix and you get quite a formidable unit.
Both teams will be playing each other in the second fixture so it could well decide who tops the group eventually. Japan and Senegal are no pushovers so this match could be key.