http://www.fangraphs.com/blogs/diving-into-first-base-maybe-not-crazy/ As the link notes, this is not about injuries. This is purely about whether diving or running through the bag is faster. Take your injury arguments elsewhere. I've long been in the minority (I think) by believing that diving could be (theoretically) slightly faster than running through the bag, but I know everyone has strong opinions on this. It feels like it could be, if done perfectly by a guy with the right body type who practices it regularly. But it also seems like it just happens willy nilly a lot of the time which negates the likelihood that the diver is doing it the optimal way. Also if you do it enough to make sure you are doing it the optimal way, that probably increases your chances of injury. No doubt, injury risk is the trump card that really invalidates the rest of the argument.