> Seems like all major American sport franchises (NFL, MLB, NHL, NBA) would love to have this data The NFL and NBA already have it, as do college (American) fo

> Seems like all major American sport franchises (NFL, MLB, NHL, NBA) would love to have this data The NFL and NBA already have it, as do college (American) football teams, AFAIK. I don't know about American baseball, but I do know that they track things like the rotational velocity of pitches and, very trendy now, the 'launch angle' of a batted ball (I suppose the movement of baseball players, other than the efficiency of fielders responding to a ball, is neither interesting nor unpredictable). Here's an article about that data as applied to Lebron James, who apparently is very efficient with his movement like Messi. https://news.ycombinator.com/item?id=17333058 https://news.ycombinator.com/item?id=17333058 I wonder why all sports don't put sensors in balls to eliminate judgment calls by referees, but perhaps either it's not worth the expense, it won't bring in more fans, or like self-driving cars, the computer errors will seem egregious to fans.