Shoguns loss to Forrest & the first Machida fight wich I consider a robbery.
Fedor getting slaughtered by Bigfoot was very hard to watch.
BJs loss to Diaz and the draw with Fitch as he was obviously more skilled than both and just lost due to his bad cardio.
There have been alot of hard fights to be honest but these where the ones that popped in my head. Being a fan of Shogun & Penn is always a rollercoaster. Two very skilled guys with exciting fightsyles that just can't seem to stay in shape.