I was curious about the in-depth player stats from yesterdays game, Brazil - Croatia (specifically to assess Ivan Perisic's impact in the game) and came across a bunch of sites that provide basic stats like goals, cards, possession, shots, etc. I found the UEFA homepage particularly informative. However I did not manage to find a single source that has the distance covered by each player at the World Cup. This is a very common stat in Europe that's frequently reported at half-time and post-game (e.g. here are stats for Champions League 2013-2014).
How to find distance covered for players during the World Cup?