GSP will beat diaz IMO. He has has done his thing at WW, no one can beat him... time to move up a weight class and make a run for the MW belt. Same with Silva, no one can touch him... move up an make a run at the title at LHW.I can't wait to see Diaz vs GSP. That's going to be the first real time that GSP is going to be seriously worried about losing. He hasn't fought anybody that could beat him since he beat Hughes way back in the day after losing to him. Diaz can do it. He's got a weird style of fighting and he can take a punch like a girl from a trailer park. If it goes to the ground, he'll sub GSP. Those Diaz boys are ghetto, but they're hella good fighters.
I think both guys are capable.