Barbarian vs Mystic
This is probably one of the most challenging 1v1's an APS class can have, Mystic seems to have a permanent, 100% rate stunlock that is extremely hard to break out of or avoid. Mystic is without a doubt one of the most challenging classes to fight single handedly, and their high defensive ability makes it even more challenging. I seem to pull through though, but not without struggling greatly at the end of the 1v1 Playoffs.
Sit back, and let the cancer flow through you
Enjoy