Hockey- Dominic Hasek was great when he was in Buffalo, the greatest hockey player I ever saw. The guy had a slinky for a spine and made some of the most unbelievable saves i've ever seen.
Basketball- David Robinson is probably the most generous athelete and one of the most underrated IMO, of all time. I remember him putting up like 76 pts to win the scoring title on the last game of the year.
Baseball- BlackJack McDowell, i'm a huge Chisox fan and this guy was lights out, too bad the strike shortened year was there best chance of winning it all, untill this season of course.
Boxing- Lennox Lewis, the guy was tough, arrogant, and smart, like all great boxers.
Football- Shannon Sharpe, he said some harsh things about Marino, and I can't understand half the stuff he says on tv, but he was one of the greatest trash talkers of all time, and one of the greatest Te's of all time.