Premier League Insights: Mid-Season Analysis
With more than half the season completed, we now have sufficient statistics to assess the performance of Premier League teams and predict how the remainder of the season may unfold.
Expected goals (xG) provides insight into how effectively teams are executing fundamental aspects of football, such as creating quality scoring opportunities and limiting their opponents' chances.
Historically, teams with a higher xG difference—indicating they dominate games—have a better likelihood of achieving success.
So, what do the statistics reveal? If teams maintain their current performance levels, the following predictions can be made:
Despite Pep Guardiola's assertions, the title race appears to be a two-horse contest, with Arsenal emerging as the strongest team in the league and likely champions.
With three Champions League spots seemingly secured, the remaining positions will likely be contested by Liverpool, Manchester United, Newcastle, and Chelsea.
The relegation battle appears settled, as Nottingham Forest and Leeds United are performing significantly better than West Ham.
Aston Villa and Sunderland have achieved results that exceed their overall performances, suggesting their current form may regress as the season progresses.
Wolves have underperformed relative to their xG but are expected to avoid breaking Derby's record for the lowest points total in Premier League history.
For Arsenal supporters, the encouraging news is that the team with the highest xG difference has won the Premier League in three of the last four seasons. The only exception was in the 2023-24 season when Manchester City claimed the title despite Arsenal's superior underlying metrics.
Interestingly, Arsenal is not dominating matches as they did two years ago, while Manchester City has not been the formidable force they once were under Guardiola.
In the Champions League race, it may come as a surprise that Manchester United ranks highly in xG, especially following the dismissal of Ruben Amorim, whose 32% win rate in the Premier League has been widely criticized. However, despite his overall tenure being viewed as unsuccessful, the Red Devils displayed improvement under his leadership before his departure. New interim manager Michael Carrick takes over a team that has been performing like a top-six side in recent months.
When comparing xG differences with points earned this season, a clear pattern emerges, as most teams' results align closely with their overall performance. However, three teams—Aston Villa, Sunderland, and Wolves—have diverged from their expected xG outcomes, either positively or negatively.
Aston Villa and Sunderland have likely already met their season objectives, with Opta assigning Villa a 96% chance of qualifying for the Champions League and Sunderland a 99% chance of avoiding relegation. This success is not merely about deserving their positions in the table; their ability to score and prevent goals has earned them these standings, aided by Villa's exceptional long-range finishing and Sunderland's goalkeeper Robin Roefs, who is regarded as the league's best shot-stopper.
However, this season's achievements are built on precarious foundations, indicating that both Villa and Sunderland must continue to improve if they wish to establish themselves among the Premier League elite long-term and avoid the pitfalls of second-season syndrome.
Villa fans may argue that their team has consistently outperformed their xG under Unai Emery, while Sunderland supporters might contend that metrics cannot capture the spirit of teamwork and determination. Nevertheless, an analysis of the points and xG differences of the 200 Premier League teams over the past decade reveals how unusually efficient both teams have been in accumulating points this season.
Conversely, Wolves have played like a relegation-bound team, yet their performance has improved compared to their previous low points tally, making their recent results less surprising. Tottenham and Leeds serve as examples of how teams can only defy their xG for so long. Early in the season, Tottenham appeared to be strong Champions League contenders, while Leeds seemed destined for a challenging campaign. However, Tottenham's xG was significantly lower than their points suggested, whereas Leeds' was notably higher. As the season has progressed, their results have gradually aligned with their xG, providing a more accurate reflection of their performances.
While expected goals is not flawless and cannot capture every nuance of football, historical data demonstrates its reliability in predicting a team's long-term success. Will Arsenal secure the title they statistically deserve? Will Aston Villa and Sunderland continue to outperform their expected goals? Time will tell.