OK, so he hasn't been a prospect in nearly 15 years, but it's worth noting that Kerry Wood ended his career today, fittingly enough, with a strikeout.
As a Cubs fan, I can personally say that he was equal parts awe-inspiring and utterly frustrating. When all is said and done, he showed explosive glimpses of the promise that made him a first-round pick in 1995, but fell short of the expectations for his overall career due to numerous health issues. That he lasted this long in the majors, to me, is a minor miracle given that he fought elbow injury early, and persistent shoulder issues thereafter. When he was right, his curveball was arguably the best of his era, and just as devastating as Randy Johnson's slider or Pedro Martinez's fastball.
The real reason I post this is to take notice of what he accomplished as a 20-year old rookie in 1998, turning in not only the best single-game rookie performance of all time, but also (in the opinion of many, and the Game Score method developed by Bill James) the best-pitched regular season game of all time. 20 K's, 1 H, 1 HBP, 0 BB, CG - 5th major league start. Simply stunning.