First place in the AFC West will be on the line when the Kansas City Chiefs and Los Angeles Chargers collide on Thursday Night Football. The Chiefs (9-4) have won six straight games to surge into first place in the division. Meanwhile, the Chargers (8-5) are one game behind Kansas City. Kickoff is 8:20 p.m. ET. Kansas City is a three-point favorite in the latest Chiefs vs. Chargers odds from Caesars Sportsbook, while the Over-Under for total points scored is 54.

Before making any Chargers vs. Chiefs picks or other NFL Week 15 predictions, you MUST see which side SportsLine expert Mike Tierney is backing.

A national sportswriter whose work appears in The New York Times and Los Angeles Times, Tierney has covered the NFL for decades and reported from seven Super Bowls. He's used his experience to crush the NFL, going 187-147 against the spread the past three full seasons.

In addition, Tierney is an outstanding 27-14-1 in his last 42 picks involving the Chargers. Anyone who has followed him is WAY UP.

The Chiefs' defense is playing at an elite level. During the six-game winning streak, Kansas City is allowing 10.8 points per game, which ranks second to only the Patriots (10.0) over that time. By comparison, the Chiefs allowed 29.0 points a game over the first seven games of the season.

Kansas City will face a Chargers offense that is on a roll. Led by quarterback Justin Herbert, Los Angeles has scored at least 35 points in three of its last four games. Overall, the Chargers have scored at least 35 points in four games this season; just two teams this year have more 35-point games.

Now, Tierney has pored over the rosters and stats and made his pick for Chiefs vs. Chargers. We can tell you he's leaning Over the total, but he knows a crucial X-factor that makes one side of the spread a must-back! You ABSOLUTELY need to see what it is before locking in any picks of your own.

Who wins Chiefs vs. Chargers on Thursday Night Football? And which crucial X-factor makes one side of the spread hit HARD? ... Join SportsLine right now to see which side of the Chargers vs. Chiefs spread to jump on, all from the NFL expert who's 27-14 on Chargers picks!