March Madness has arrived and it's time to fill out those NCAA men's basketball tournament brackets!

Kentucky, Syracuse, North Carolina and Michigan State have locked in the number one seeds, and all look like strong Final Four contenders. But, as is the case with some years, Cinderella teams emerge to bust brackets everywhere, competing fiercely with upper-echelon teams for a chance to be crowned NCAA tournament champions.

If you're looking to fill out a bracket to get in on the madness, you can find one courtesy of ESPN, courtesy of Yahoo Sports, courtesy of Huffington Post and courtesy of Sports Illustrated.

The First Four, the round that first expanded the field to 68 teams last year, will be played on March 13 and 14, followed by the second round, which will be played on March 15 and 16. The third round will be played on March 17 and 18, while the Sweet 16 and Elite Eight will be played from March 22 to 25. The Final Four will take place in New Orleans at the Mercedes-Benz Superdome, the national semifinals tipping off on March 31 and the championship game tipping off on April 2.