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Donovan gets an honorable mention here. His saga involved a short stay in the pros, but it was decidedly a college story, so I'm giving him a pass to be included (I'm sure he's thrilled).
As most people probably remember, he was on top of the college basketball world in 2007, having just won Florida's second consecutive national championship, the first school to do that since Duke back in the early '90s.
At the same time, however, he was also losing a number of his best players to graduation or the pros (including the entire starting lineup), and the future didn't necessarily look so bright in Gainesville.
So Donovan did what any logical person would do in that situation (and I'm not being entirely facetious): He signed a big-money contract (five years, $27.5 million) to join the pro ranks at the height of his power and value.
He had only been on the job with the Orlando Magic for one day, though, when he publicly expressed reservations about having taken the new job. The NBA is much tougher than the college ranks, of course, and being competitive on a regular basis is far less certain, dealing with grown men, free agency and the like.
So he put his tail between his legs and reached an agreement with the Magic to release him from his contract before slinking back to the Gators.
His, however, is a story with a happier ending than most others on this list, as he quickly recruited one of the top freshman classes in the nation going into the next season and has continued to lead Florida to 20-win seasons each year since.
If only we all could have the "integrity" to renege on a $27 million contract.