Chiefs are latest repeat NFL champion looking to three-peat - ESPN

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.

There have been nine instances in NFL history where a team has won back-to-back Super Bowls. No NFL team returned to the big game in the following season. Only one franchise — the Buffalo Bills — has reached the Super Bowl in four straight years, though they lost each time.

The Green Bay Packers were the first to go back-to-back in 1966-67, while the Pittsburgh Steelers strung together two separate runs in the 1970s. The 1990s saw two teams — the Denver Broncos and San Francisco 49ers — win consecutive Super Bowls.

Here's a look back at how each team fared in its upcoming season.

The Packers dominated in the 1960s, winning two Super Bowls and three championships before the AFL-NFL merger created the Super Bowl.

Green Bay underwent a major change after winning in 1967. Vince Lombardi stepped down as coach and Phil Bengston became the lead man. Bengston spent nine seasons running Lombardi's defense, turning it into one of the NFL's best.

In his first season, Bengston wasn't able to replicate Lombardi's success. The Packers went 6-7 and missed the playoffs for the first time since 1964.

The Dolphins strung together two titles row with legendary coach Don Shula, including an undefeated 1972 season. In 1974,