College football set up a four-team playoff to determine the best team five years ago.
One matchup keeps repeating.
The last three champions get to battle for supremacy Monday as top-ranked Alabama takes on Clemson for the fourth straight season. ESPN and ESPN2 have coverage at 8 p.m.
It's the third championship matchup between the schools since 2016, with a semifinal contest last year.
Both teams plowed through the regular season undefeated, won their conference championship and cruised in the semifinal last week.
In the Football Championship Series, Eastern Washington takes on North Dakota State on ESPN2 Saturday at noon.
The NFL playoffs get going Saturday at 4:30 p.m. on ESPN and ABC as the Texans host the Colts. The teams split their meetings this season, with the Texans posting an overtime triumph in the first contest.
The Cowboys battle the Seahawks Saturday at 8 p.m. on Fox.
CBS gets the Ravens against the Chargers Sunday at 1 p.m., with the Eagles trying to defend their title with a trip to Chicago on NBC at 4:30 p.m.
The Saints, Rams, Chiefs and Patriots await this week's winners.
The Mavericks meet the Celtics on ESPN Friday at 8:15 p.m., followed by Thunder-Trail Blazers.
The Wizards meet the Heat Friday at 8 p.m. on NBC Sports Washington and face the Thunder Sunday at 7 p.m. on NBC Sports Washington-plus.
Tulane tangles with SMU Friday at 7 p.m on ESPN2.
CBS has Georgetown against St. John's Saturday at noon and Indiana's contest with Michigan Sunday at 4:30 p.m.
Michigan State meets Ohio State Saturday at noon on Fox followed by Villanova-Providence.
Kentucky takes on Alabama Saturday at 1 p.m. on ESPN, with Clemson against Duke at 8 p.m.
Virginia faces Florida State on ESPN2 Saturday at 3 p.m., followed by Kansas-Iowa State. South Carolina takes on Florida at 7 p.m., then it's West Virginia against Texas and BYU against St. Mary's at 11 p.m.
Butler battles Creighton on FoxSports1 Saturday at noon.
Virginia Tech hosts Boston College on NBC Sports Washington at noon, followed by Wake Forest-Georgia Tech.
NBC Sports network offers LaSalle-Massachusetts Saturday at 1 p.m. and Duquesne against Davidson at 6 p.m.
Marquette meets Xavier on Fox Sunday at noon.
It's Seton Hall against DePaul on FoxSports1 Sunday at noon.
There's three games on NBC Sports network Sunday, starting at noon with Richmond-Dayton. George Washington battles St. Joseph's at 2 p.m. followed by St. Bonaventure's contest with George Mason.
In women's hoops, FoxSports1 has DePaul meeting Marquette Friday at 8 p.m.
There's three contests on ESPN2 Sunday, starting at noon with SMU-Cincinnati. Missouri meets Tennessee at 2 p.m. and Texas tangles with West Virginia at 4 p.m.
lorida State faces North Carolina at 1 p.m. Sunday on NBC Sports Washington.
There's outdoor college ice hockey Saturday at 3:30 p.m. with Notre Dame hosting Michigan on NBC Sports network.
The Capitals visit Dallas Friday at 8 p.m. on NBC Sports Washington-plus and Detroit Sunday at 5 p.m on NBC Sports Washington.
The Blackhawks take on the Penguins Sunday at 8 p.m. on NBC Sports network.
It's Tampa Bay-San Jose Saturday at 11 p.m. on NBC Sports Washington.
ESPN2 has women's gymnastics between Nebraska and UCLA Friday at 9 p.m.
Ohio State takes on North Carolina State in college wrestling Sunday at 6 p.m. on ESPN2.
In rugby, it's Leicester against Gloucester on NBC Sports network Saturday at 10 a.m. and the Wasps take on the Saints Sunday at 10 a.m.
There's Motocross racing from Anaheim Saturday at 11 p.m. on NBC Sports network.