In case you're not familiar with expected goals (xG) yet, the statistic is built around the idea that the majority of teams and players convert the same chances at the same frequency. For the most part, the best teams and players aren't the best because of their ability to finish a high percentage of attempts; they're the best because of their ability to generate a high volume of high-quality shots.
In other words, it puts a number on the idea that you hear managers talk about every weekend: Who created the better chances?
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