The Christmas Day sports slate is filled with cheer, with two NFL Week 16 games and five matchups as part of the 2021-22 NBA schedule. The full day of NBA action includes Hawks vs. Knicks at noon ET, Celtics vs. Bucks at 2:30 p.m. ET and Mavericks vs. Jazz at 10: 30 p.m. ET. The NBA's marquee games pit top title contenders against each other, with Warriors vs. Suns at 5 p.m. and Nets vs. Lakers at 8 p.m. ET. 

The battles for NFL playoff positioning continue with Browns vs. Packers in Green Bay at 4:30 p.m. ET and Colts vs. Cardinals at 8:15 p.m. Before you make any Christmas Day picks and parlays, you NEED to see what SportsLine's advanced computer models have to say about all the games. 

The SportsLine Projection Models simulate every game 10,000 times, and the NBA model is up well over $10,000 over the past three-plus seasons. It is on a stunning 46-23 run this season on top-rated picks against the spread. The NFL model is up over $7,000 for $100 players on top-rated NFL picks since its inception six-plus years ago and is on an incredible 133-96 run on top-rated NFL picks that dates back to the 2017 season.

Now, these models have analyzed the Christmas Day NBA and NFL action and revealed its best five-line parlay picks. This five-way parlay could lead to a HUGE payout of more than 24-1!

One part of the five-way parlay we'll give away: The model is backing the Jazz cover as a 12-point favorite  against the Mavericks to close out Saturday's slate. The model says Utah covers in nearly 60 percent of simulations, making it an excellent choice for your NBA and NFL parlay picks. You can confidently lock that in as a key part of your Christmas Day parlays. 

The models also have identified four other extremely strong picks that NEED to be in your five-way parlays, including an underdog that is facing a team that has taken a big step back, making this team a MUST-BACK! You ABSOLUTELY need to see who it is before locking in any NBA or NFL parlays.

So where does the betting value lie for Saturday's Christmas Day NBA and NFL action? And which team is a MUST-BACK in your Christmas Day parlays? ... Join SportsLine here to see which teams cover the spread, all from the models that have been on dominant runs on top-rated NBA and NFL picks!