The Big 12 is home to some of college football's most storied rivalries.
One of the most historic is the Red River Rivalry between the Texas Longhorns and the Oklahoma Sooners, which is played annually at the Cotton Bowl in Texas.
Other famous rivalries within the Big 12 include Bedlam, between the Sooners and Oklahoma State, as well as the Sunflower Showdown, between Kansas State and Kansas.
With that, here are the top five rivalries in the Big 12:
Collin Klein (left)
One of only two in-state rivalries not in the state of Texas in the Big 12, the Sunflower Showdown is the annual matchup between the Kansas State Wildcats and the Kansas Jayhawks.
The Jayhawks have the overall advantage in this series 64-41-5. But in games that have been played for the Governor's Cup Trophy, the Wildcats lead 24-19-1.
This series if the fifth-longest series in Division I college football history, dating back to 1902.
One of the most interesting notes in this series is the 1980 meeting. The Jayhawks won the game 20-18 but later had to forfeit the win because one of its players was ineligible. Both schools now dispute the record of the Sunflower Showdown because of this.
The Wildcats won the 2012 edition of this game in Manhattan by a score of 56-16, marking the fourth-straight year Kansas State has claimed the Governor's Cup.
A Texas rivalry that dates back to 1928, the Texas Longhorns have dominated this rivalry against the Texas Tech Red Raiders.
Currently, the Longhorns hold a 47-15 lead in the all-time series.
The two schools play for the Chancellor's Spurs, a set of gold and silver spurs awarded to the winner of the game. This was introduced in 1996, and the Longhorns have won them 13 of the 17 times they've been given out.
While this rivalry has no official name, the Baylor-TCU rivalry is one of the best in the Lone Star State.
The Horned Frogs hold the edge in this rivalry, but barely. The record stands at 51-50-7. TCU has also won four of the last five matchups, dating back to 2006.
Both schools used to be members of the Southwestern Conference, which is where this rivalry originated.
A report by Daniel Salazar of TCU 360 says that the student governing association at TCU and Baylor are considering finding a name for the rivalry.
The other in-state rivalry in the Big 12 not found in Texas is Bedlam, the heated rivalry between the Oklahoma Sooners and the Oklahoma State Cowboys.
Surprisingly, the Sooners have dominated this series and hold a 83-17-7 lead. But the Cowboys signature win in this rivalry came in 2011, when they beat the Sooners to seal a Big 12 title and the fans stormed the field.
The Sooners got their revenge for the 2011 loss last season with a 51-48 win in overtime.
These two schools are just over an hour away from each other on Interstate-35, so the bad blood is always close by.
One of the most historic rivalries in all of college football is the Red River Rivalry between the Texas Longhorns and the Oklahoma Sooners.
The Longhorns lead this series overall 59-43-5 over the Sooners. But last year's 63-21 dismantling of Texas by Oklahoma in the Cotton Bowl was certainly a black mark for the Longhorns.
The name of this rivalry comes from the Red River, which is part of the border between Texas and Oklahoma.
The game is played annually at the Cotton Bowl, a neutral site in Dallas, Texas.