Predicting Premier League, LaLiga, Bundesliga trends based on last season: Will Man City, Bayern repeat?

The European soccer season gets underway this weekend, with three of Europe's big five leagues -- the English Premier League, Spanish LaLiga and German Bundesliga -- all beginning their 2021-22 campaigns. (The French Ligue 1 began last weekend, and Italy's own Serie A kicks off on Aug. 21.)

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Before last season, I put together a big preview that involved different statistical factors: efficiency, ball control, field factors and regression-to-the-mean factors. The transfer window doesn't close for a few more weeks, so the rosters aren't all sorted out just yet, but as we prepare to dive into the marathon that is a European club season, let's see what some of those stats -- particularly that last category -- can tell us about the season ahead.

Jump to: Regression factors | Premier League | Bundesliga | LaLiga | Serie A | Ligue 1


First: Let's talk about regression-to-the-mean factors

We can make pretty good projections based simply on how a team did last year and how much money they've spent since last year ended, but some teams will still see the benefit (or liability) of extra bounces in a given season.

Liverpool's 2019-20 squad, for instance, was the perfect example of what regression-to-the-mean factors look like. Jurgen Klopp's squad was clearly awesome overall, but the Reds were also a little too successful in close-game situations -- and probably a little lucky in the injuries department -- to maintain quite that high a level moving forward. Sure enough, they went from averaging 2.50 points in matches decided by 0-1 goals to averaging a far more mortal 1.43, which cost them about 20 points in the table alone. Factor in a devastating number of injuries (Virgil van Dijk, Joe Gomez, Diogo Jota, Joel Matip etc.) and Liverpool had to scramble just to maintain a spot in the Champions League.

Injuries alone make Liverpool a massive progression-to-the-mean candidate this season, but let's walk through some pretty common regression factors to see who else we might be under- or overestimating. After all, these factors gave us pretty good hints regarding the regression of not only Liverpool, but also teams like Real Madrid, Juventus, Lazio and Marseille were facing (and the improvement Manchester City was likely to undergo).

So what does it have to say about this season?

Close-game performance

Two things to understand about close-game performance: (1) The better teams are better at it. Duh, of course they are. Using a team's overall points per game, you can run a regression to come up with a pretty accurate projection of how they should be doing in close games (aka matches decided by 0-1 goals). (2) Some teams are still a little too good or bad in close games in a given year, with Liverpool 2019-20 being a very good example.

Another good example: last year's PSG. Les Parisiens were good enough overall that they should have expected to average close to two points per game in their close matches. Instead, they averaged 1.29. It cost them about 12 points in a Ligue 1 race that they lost by a single point.


From a close games perspective, PSG (-0.84 points per game compared to expectation) were by far the least lucky team in Europe's Big 5 leagues. (You could say their luck has turned around in a different way this offseason.)

Compared to what you would expect from their overall performance, others were dragged down a bit by the close-games god as well.

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