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Kevin Seraphin shined in the 2012 Olympics.
The aforementioned Kevin Seraphin offers a lot of promise as an NBA center. He has a big enough body (6'9", 264 pounds) to bang with the bigger centers in the league and he swatted away 2.3 shots per-36 last year. In addition to that, he also posted 13.9 points and 8.6 rebounds per-36.
Seraphin saw only 20.6 minutes per game last year, but that should increase to at least 26 minutes per game this year as he continues to develop. He impressed in the 2012 Olympics coming off the bench for France and is still only 22 years old.
Jan Vesely is a very athletic forward, and at 6'11", he has the height to play power forward but the speed and agility to play small forward. His leaping ability makes him a decent shot-blocker (1.1 blocks per-36), and if he can capitalize on that and begin to develop better court instincts, he could find himself a lot of easy buckets with John Wall setting him up for dump offs and lob passes.
Vesely doesn't have a high basketball IQ and he is going to have to learn how to stay out of foul trouble before he can play a lot of minutes, but he was taken No. 6 overall in 2011, so expectations remain high.
Singleton, as mentioned, has the tools to become a premier defender. The question is whether he can become much more than that. He has a decent three-point shot, but can't create shots for himself. He's a little undersized to play power forward, and right now, his primary position will be small forward.
Singleton still has a lot of work to put in offensively. If he doesn't, he'll never be much more than an emergency guy off the bench to put in when an opposing wing gets hot, and the Wiz have much higher hopes for him considering they spent the No. 18 pick on him in 2011.
The biggest problem Trevor Booker faces is being a tweener. At 6'8", he could benefit from an inch or two more to play the 4 spot, but he leaps well enough to compensate for it. He plays very hard and finishes well around the basket, but needs to work on his shooting so he can play more time at small forward. He's foul-prone and can't hit free throws either.
Booker is a work in progress but a very good project for the Wizards.
Booker was taken No. 23 in 2010 by the Minnesota Timberwolves and wasn't highly regarded coming out of Clemson, but he has since proven he could be one of the steals of that draft class. Pity for the Wolves that they didn't reap the benefits.