Sudbury police are dealing with a pair of robberies where the victim knew the attackers in both cases. Early Wednesday afternoon two men approached a man they know and demanded money from him. The robbers hit the man with a baton and ran away. Police found them Wednesday night and both face robbery charges. The second incident took place Wednesday evening where a man was assaulted and choked by another guy he knows and then robbed. The assailant later turned himself in and was charged with robbery.