Best fights that never happened

What do you think are some of the best fights that never happened?

Here are a few (in my opinion):

Kazushi Sakuraba vs Rickson Gracie

Kazushi Sakuraba vs. Frank Shamrock

Wanderlei Silva vs Igor Vovchanchyn

Don Frye vs Randy Couture

Gina Carano vs Ronda Rousey

Don Frye vs Marco Ruas is another one. Was supposed to happen at UFC 9, but Ruas pulled out with an injury and was replaced by Amuary Bitetti.

Liddell vs Hendo

Randy Couture vs Fedor Emelianenko 2008

Jon Jones vs Anthony Johnson 

GSP vs Anderson Silva 

Matt Hughes vs Dan Henderson

Takanori Gomi vs BJ Penn

Frank Shamrock vs Sakuraba

Joe Rogan vs Wesley Snipes 

And just to see the egg take his comeuppance I wanted Tito vs Dana.

Brock v Fedor 

Randy Couture vs Fedor Emelianenko

At the time I was super hyped for Karo vs Hughes. Also Tito VS Metzger

"Also Tito VS Metzger"

If you are talking about Tito Ortiz vs Guy Mezger, they fought twice.

The jones vs Gustafsson rematch in a timely manner. 

I would like to have seen a rematch between Wanderlei Silva and Gilbert Yvel, because when they fought at PRIDE-11 it ended in 21 seconds in a no contest after Yvel kicked Silva in the balls.

Another fight that happened, but did not really happen, which I'd like to have seen is Kazuyuki Fujita vs Mark Coleman. Fujita came in and immediately threw in the towel as he was exhausted after defeating Mark Kerr in the PRIDE Grand Prix, so Coleman basically received a bye into the finals against Igor Vovchanchyn, which makes me wonder what would have happened had Coleman actually had to fight his way into that final match.

"The jones vs Gustafsson rematch in a timely manner. "

I totally agree that this is a rematch which should have already happened, but for the purpose of this thread, I'm talking about fights that never happened at all, not rematches.

Marco Ruas vs Bas Rutten

Marco Ruas vs Rickson Gracie

Bas Rutten vs Rickson Gracie

Frank Shamrock vs Dan Henderson would have been interesting. The two met in a submission grappling match in The Contenders and Frank won pretty quickly with a submission, but it was early in Henderson's career, so I think if the two would have fought in a match that allowed striking Frank would have probably had a far more difficult match on his hands.

Wanderlei Silva vs Anderson Silva would have been very interesting.

Kerr vs. Coleman

Ken vs. Tank. I think Ken would have held that kneebar extra long.

Mark Schultz vs. whoever in a second UFC appearance.

Rico Chiapparelli vs. Rickson

Matt and Mark Hughes used to pound each other behind the barn, but we didnt get to see it happen.......

"Ken vs. Tank. I think Ken would have held that kneebar extra long."

Prime Ken Shamrock would have almost certainly beaten Tank. After Ken started going on his losing streak Tank would have stood a good chance of landing a bomb and taking him out like Kimbo did.

"Mark Schultz vs. whoever in a second UFC appearance."

I forgot about Mark Schultz. One of the best fighters who barely had any fights. I would loved to have seen prime Mark Schultz vs say Don Frye or Mark Coleman.

Also

Kerr vs Royce was announced at one time

Jones vs Rumble

Rumble vs Rampage

Fedor vs Cain

Werdum vs Barnett

Andy vs Jones

Ken vs Frank

Sergei vs Fedor

Sergei vs Cro Cop

Arvlovski vs Cro Cop

Nelson vs Cabbage

"Kerr vs Royce was announced at one time"

I am actually kind of glad that this fight never happened. Kerr was a physical monster at the time, and he'd have just laid on Royce and pounded him, like he did to Fabio Gurgel.