"Bloomberg News estimated in 2014 that 1,750 fans per year are hurt by batted balls at MLB games. Amid debates over how much protection teams should offer spectators, we wanted to find out which areas of stadiums might be the most dangerous, which could help us figure out what could be done to prevent more fan injuries."

https://fivethirtyeight.com/features/we-watched-906-foul-balls-to-find-out-where-the-most-dangerous-ones-land/