Like many of the favourites, we're yet to see the best of Brazil at this World Cup.
Two pedestrian performances against Switzerland and Costa Rica were a stark contrast to their qualifying campaign, when they lost only once in 18 games and topped the South American group ahead of Uruguay by 10 points.
But Brazil are no strangers to the latter stages of World Cups, having qualified from the group stage of every one since 1970 and there's a sense that they are going through the gears—and that's bad news for Mexico. Their notable victories over Germany and South Korea marked an impressive start in Russia, but some of that momentum has ebbed away after a thoroughly disappointing 3-0 defeat by Sweden, who topped their group.
Philippe Coutinhom rather than Neymar—is the man Mexico need to stop at the Samara Arena
The signs are that Brazil are moving in the opposite direction. Predictably, all the attention is on Neymar, who scored against Costa Rica but has struggled to carry the team like he did four years ago.
Instead, their star man has been Philippe Coutinho. The Barcelona attacking midfielder has been the bright spark as Brazil grow into this tournament. His through ball assisted Paulinho for the opening goal in the final group game against Serbia, and goals against Switzerland and Costa Rica have been vital. Coutinho has scored or assisted six goals in seven games for Brazil in 2018, and he—rather than Neymar—is the man Mexico need to stop at the Samara Arena.