The World Cup is a global phenomenon. Games take place on a stage that is viewed in every country. The games provide an opportunity for players to make style statements to the whole world.
Football, more than any other sport, is about style. Players are more visible, not covered by pads, hats or helmets. They are allowed a freedom of expression that is lacking and even sometimes frowned upon in other sports. Many players have stylists and spend as much time on their physical appearances as movie stars.
Hair is a big deal in soccer. Different stages of players' careers can be referenced and even defined by what hairstyle they wore at the time. A change of hairstyle is sometimes the result of a dip in form or the signal of a fresh start for a player. Conversely, sometimes a new haircut is blamed for a loss of a form, a la the "Samson effect" from biblical lore.
For some reason, hairstyles among footballers seemed to hit their peak during the late '90s and early 2000s, so many of my choices come from that era. These days, most players tend to take a conservative route to hair maintenance.
So, here you have it: The Top Ten World Cup Hairstyles. Cheers, and here's hoping that future generations grow it out a little more.