It is going to be an exciting fight! Mir's only chance IMO is for him to get it to the ground quick and catch a sub in a scramble.
Apart from that I think Hardonk is going to prove too powerful and will have the better cardio for sure. Hardonk hits like a train and I promise you Mir will only be able to take a couple of Hardonk's low kicks.
Good fight, great card, can't wait for UFC 74
bet at your own risk!!