It’s official, folks. Week 11’s Monday Night Football matchup between the Chiefs and Rams has opened with the highest over/under … well, probably ever.

Apparently there was no such thing as record-keeping before 1986, so we’ll never know for sure. But it’s very likely that this is the highest NFL total of all time.

The over/under opened at 64 at the Westgate Las Vegas SuperBook, but offshore books are setting the bar a bit lower, with several posting 63.5 (including Pinnacle).

Since at least 1990, no total has opened higher than 62 — the closing over/under on the Oct. 29, 2000 matchup between the St. Louis Rams and San Francisco 49ers. Trent Green started for the Rams, Jeff Garcia started for the 49ers and the two teams fell just short with a combined 58 points.

There have been 11 games since 2003 to close with a total of 57.5 or higher (including playoffs), and three of those have come this season.

The over has done quite well in these situations over the past 15 years. And by quite well, I mean it’s gone 11-0 — covering by an average margin of a little more than 10 points.

According to reports, the Rams will be heading to Colorado to practice at a higher elevation this week. No report yet on whether the Chiefs will be doing the same.

There’s not much to take away from the small sample of three games played in Estadio Azteca this century. The total has gone over in two of the three games, but by only 2.5 combined points.

Check back over the week for more analysis on the game and be sure to check your app to see how bettors are playing this historic over/under.