The San Francisco 49ers will host the Baltimore Ravens in a key 2023 Christmas Day NFL showdown on Monday Night Football. The Ravens (11-3) lead the AFC North and hold the AFC's top seed entering the Week 16 NFL showdown, while the 49ers (11-3) are the top seed in the NFC, and have already clinched the NFC West title.

Kickoff at Levi's Stadium in Santa Clara, Calif., is set for 8:15 p.m. ET. San Francisco is a 6.5-point favorite in the latest Ravens vs. 49ers odds, while the over/under for total points scored is 47.5. Before you make any Ravens vs. 49ers picks of your own, you NEED to see what SportsLine NFL expert Mike Tierney has to say.

A veteran sportswriter whose work appears periodically in The New York Times and Los Angeles Times, Tierney has covered the NFL for decades and reported from seven Super Bowls. He is coming off a typically strong 2022 NFL season in which he went 68-54-6, returning $815 to $100 players.

In addition, he is an amazing 45-18-2 on his past 65 picks involving the Ravens, returning a whopping $2,510! Anyone who has followed him is WAY UP!

Tierney knows San Francisco is led by second-year quarterback Brock Purdy, a seventh-round pick in the 2022 NFL Draft. In 14 games, Purdy has completed 268 of 384 passes (69.8%) for 3,795 yards and 29 touchdowns. He has thrown seven interceptions, but has a rating of 119. He's also rushed for two scores.

The expert also has considered that sixth-year veteran Lamar Jackson continues to play at a high level and has thrown seven touchdowns with just two picks over the past four games. He nearly reached 100 yards rushing in the 23-7 win at Jacksonville last Sunday night, carrying 12 times for 97 yards.

Now, Tierney has locked in on Ravens vs. 49ers. We can tell you he's leaning Under the point total and he's found a critical X-factor that has him jumping all over one side of the spread! You NEED to see his analysis before locking in any Ravens vs. 49ers picks of your own.

Who wins Ravens vs. 49ers on Monday Night Football? And what critical X-factor makes one side of the spread hit HARD? ... Join SportsLine right now to see which side of the spread you need to jump on NOW, all from the expert on an OUTSTANDING 45-18 run on picks involving the Ravens!