Brazil defender Danilio says his team is still improving, which is sure to get Mexico's attention as the two prepare to meet in one of Wednesday semifinals of the Under-20 World Cup.

Brazil's victory over Spain on penalties in the quarterfinals - after a 2-2 draw through extra time - was regarded by many as the best match of the tournament, featuring end-to-end attacking, dominant possession and two of the best young keepers in the world.

If Brazil gets better, that's bad news for Mexico and a warning to France and Portugal, which meet in the other semifinal. The winners face off in the final on Saturday in Colombia's capital Bogota.