The Kansas City Chiefs begin their quest to become the first NFL team to win three consecutive Super Bowls when they open the season against the Baltimore Ravens on Thursday.
As hard as it is to win two in a row, a three-peat is a rarity among all major sports.
Across the NBA/MLB/NHL/WNBA, there have been 14 instances where a team has won three straight titles. The Las Vegas Aces are currently looking to become the second team in WNBA history to win three straight -- the Houston Comets won four in a row from 1997-2000.