Dimes-n-Clanks (DC's for short)
Dimes, for all the assists he racks up.
Clank, for all the jumpshots and free throws he clanks.
Actually, we can just go ahead and call Rondo "Dimes" when he plays really well, and "Clanks" when he plays like crap or misses a ton of jumpshots / free throws.
Perfect nickname!