Kelvin Kuo-USA TODAY Sports
Diaz's aggression in and out of the cage would make MacDonald vs. Diaz a spectacle.
Now this is a compelling fight.
Nick Diaz's endless cardio, strong chin and great Brazilian jiu-jitsu have made him a top welterweight over the years. If Rory MacDonald really, truly wants a fight with a top welterweight, this is perhaps an even better matchup than a fight with Condit.
Diaz slapped around B.J. Penn at UFC 137 to end up in his fight with Carlos Condit, which he would lose by decision. Skill for skill, though, Diaz is a nightmare matchup for MacDonald, and is very capable of bringing some serious hurt his way.
MacDonald's clinch and wrestling game is not going to cut it against Diaz, who is very capable of shrugging off any grappling exchange—assuming he doesn't go for a submission. Meanwhile, Diaz's high-volume striking and always-press-the-action style will not let MacDonald bully him to the cage for any length of time.
Perhaps more than anything, the buildup to this fight would be amazing, as MacDonald not only beat, but downright embarrassed Nick Diaz's younger brother back at UFC 129. MacDonald's awkward, axe-murderer stoicism would be hilarious to see against Diaz's irreverence, and would make press conferences a must-watch for MMA fans.
Unfortunately, this does not really seem possible at this time, as Dana White recently said they are working to book Diaz against Georges St-Pierre.
Still, if the UFC decides to have integrity in their matchmaking (or if Nick Diaz keeps up his long tradition of ducking title fights), this could end up happening.