The playoffl-bound San Francisco 49ers host the NFC West-rival Los Angeles Rams on Saturday. Kickoff from Levi's Stadium is set for 8:15 p.m. ET. San Francisco is a seven-point favorite, while the Over-Under for total points scored is 45.

Before you make any 49ers vs. Rams picks of your own, you NEED to hear what NFL expert Tom Fornelli has to say.

A CBS Sports writer since 2010, the entertaining Fornelli is a consistent winner when it comes to against the spread and over-under picks. And no one knows the 49ers like Fornelli. In fact, he has hit 11 straight picks involving San Francisco! Anyone who has followed him is WAY up.

We can tell you Fornelli is leaning Under on Saturday night, but his much stronger play is on the spread. Fornelli has found a critical x-factor that has him going BIG on one side! You ABSOLUTELY need to see it before locking in your own picks.

Who wins 49ers vs. Rams? And what critical x-factor makes one side of the spread a MUST-BACK? ... Join SportsLine right now to see which side of the 49ers vs. Rams spread you need to back on Saturday night, all from the expert who's an amazing 11-0 on 49ers picks!