I thought he said he wanted to play for a contender?

If you could hog all the glory, would you? If you could hold three teams hostage and wait for the highest offer, would you? If you could pitch for four months, start your off-season in October, and go into a no-lose situation for yourself all while make about $20 million dollars, would you do it? Of course you would. And, Roger Clemens would too, that's why he's headed back to the Yankees.

http://sportsillustrated.cnn.com/2007/writers/john_donovan/05/07/clemens.yankees/index.html