Every spring we compile a list of the classic prospective Tommy John elbow surgery pitchers and that group predominantly is made up of guys who are both under the age of 28 and who also throw their average fastball in the middle-to-upper-90's. Such a player that made the list this season was the Arizona Diamondbacks' Taijuan Walker who came up as a big power pitching prospect with the Seattle Mariners with an upper-90's fastball and who is just 25 for the 2018 season. Well Walker didn't even make it out of April before damaging the UCL in his pitching elbow according to a Tuesday report and so he very well could be headed to season-ending Tommy John surgery. Right now, Walker is waiting for a second opinion but we all know how this will likely end. Those who own stock in Walker should already be looking for a solid replacement.