I can't verify (and may be mistaken), but I do recall Dwayne Wade doing well in the Illinois state finals in the 100m in high school, pulling 10.34 or so (which is about what Chris Johnson pulled at the same age). He's 30 now, so I doubt that ability is still there, but I'd still put him over anyone else in the NBA in a 100m dash (not 40m, or anything else pertinent to basketball) if I had to put money down. I was a sprinter in college during Wade's HS years.
EDIT: note that Chris Johnson is not even close to the fastest man in the NFL in terms of track & field (100m, composite track, spikes, blocks). It sort of irks me that his name is constantly bandied about ever since he challenged Usain Bolt to a footrace (hah).