Here's video of Bryce Harper being helped off the field after injuring his right hamstring in a game in Akron Thursday night (video via BaseballDanny35). Mark Zuckerman Tweeted the following update: "Official word on Bryce Harper is strained R hamstring. Reevaluated tomorrow."
Ugh. Looking on the bright side: at least Harper didn't get ejected. And (at least based on this video) he didn't get heckled as he was being carried off the field. So that's good.