The insight was related to winning first-service points when returning serve. This tweet has a screenshot of the association: <a href="https:&#x2F;&#x2F;twitter.com&#x2F;lapsu&#x2F;status&#x2F;620223838895407104" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;lapsu&#x2F;status&#x2F;620223838895407104</a><p>This isn&#x27;t too far from the logic: &quot;How can we win this game? Score more points than the other team&quot;.  I suppose the more interesting thing would be to compare the same correlation across players.