No. 1: Bullseye
Credit: Marvel Comics
Since very early on, Bullseye has been one of Daredevil’s most challenging adversaries. If you break it down to basics, the hero who cannot see, is pinned against the villain that can make any projectile lethal, with pinpoint accuracy. This normally would not bode well for the hero, which is why this choice of antagonist would be so perfect for season 3.
In season 2, Daredevil was challenged by Frank Castle and Elektra, but on a more ideological level. They both challenged Daredevil on his ideals of not taking another person’s life. A battle against Bullseye would create a more physical challenge, similar to the ending of season 1 when he came to blows with Wilson Fisk.
This antagonist choice has been mostly confirmed, we are basically just waiting on an official announcement of the actor to portray the deadly marksman. Rumors indicate it will most likely be either Jason Statham or Sam Witwer in season 3.