THE ROVER - Don't get me wrong - I come down on the side of sprints as it relates to conditioning and possibly post-game activity. I'm just thinking about a pitching outing up North in March - maybe 40-45 degrees when the player sets foot on the field. Not real sure sprints are something to incorporate into one's warm-up. Maybe in May down south when it's already 90 degrees and everything is already pretty loose, but I would not recommend any type of full blown sprint until after everything is warmed up 100%. Maybe jogging a few poles can be replaced with some half speed "sprints", but please don't even think about any type of sprint start or max effort on the front end to get things started.
On a related note, I have started hearing some folks talk about how stretching is unnecessary and can even be counter-productive. No idea how proper stretching can be bad, but wanted to see if anyone has looked into this further.