What was the last UFC PPV where the main event fight was actually tough to call?
 

Was it Cain vs. Brock?

Edgar/Maynard maybe.

Also, Shields/GSP was 50/50 before the fight IMO.

Thing about Cain/Brock was that most MMA fighters were saying Cain would take him.
I thought Shields would beat GSP but the betting lines had him a huge underdog.

I'd say Edgar/Penn 2, since most people thought the first Frankie win was a fluke and figured BJ would mow through him second time around.

I would have to say Shields/GSP. I was hoping it would be a good fight and wanted to see how GSP would do on the ground against Shields. The fight was still pretty close.

Edgar Maynard definitely

This. All others were apparent.