This is tough...I know I am forgetting a ton, but here are a few:
1) Vanderlei Silva vs Quinton Jackson 2
2) Frank Shamrock vs Tito Ortiz
3) Tank Abbott vs Oleg Maskaev
4) Mark Coleman vs Don Frye
5) Frank Shamrock vs. Enson Inioue
6) Ken Shamrock vs Royce Gracie 1
7) Bas Rutten vs TK
8) Igor Vovchanchin vs Fred "The Mangler" Floyd (a personal favorite)
9) Royce Gracie vs Dan Severn
10) Matt Hughes vs Frank Trigg
You forgot Manny vs Hermes, that should be in the top 5 imo.
Damn dude. That's tough. Are we talking personal all-time top ten, or just list them off?
both Pele-Macaco fights,Serra-Carter,Norgiera-Sapp
Sudo v. Ludwig has gotta be up there.
Frye vs Takayama
Ettish-Rhodes,Hackney-Yarburough
Frank Shamrock vs Horn, Lober II(best revenge beating of all time), and Tito
Randy vs Tito, Vitor I
Nog vs Sapp (ouch)
Cro Cop vs Sapp (funny)....(damn near any fight with Cro Cop that he lands a kick or two)
Rampage vs Silva II
Sak vs Royler, Royce, Renzo, and Newton (damn near any fight with Sak in it)
Coleman vs Frye I, and Pete Williams
Oleg vs Tank
Bas vs Kohsaka
Royce vs Severn
Rizzo vs Barnett
Frye vs Bittetch (UFC 9)
Lawler vs Riley (stand-up-WAR!)
Damn.....this is tough.
Frye vs Takayama
carter v.s serra
chuck liddel vs pele
royce gracie vs jason delucia 1&2
maurice smith vs coleman
Frye vs Takayama
Lawler vs Riley was SICK!!!!!
Aurelio vs Mishima was a war too!
Wand x Henderson = the best
Wand x Crocop
Sperry x Ninja
Arona x Henderson
Newton x Pele
Newton x Miletich
Nog x Crocop
Nog x Enson
Nog x Coleman
Wand x Rampage
Chuck x Rampage
Rampage x Saku
Saku x Newton
Saku x Goes
Nog x Sapp
Crocop x Igor
Fedor x Coleman
Fedor x Fujita
and many more
Lest take one from UFC
Serra x Carter
I forgot about Pele/Mocaco for sheer drama.
Maskaev should be replaced by Taktarov, LOL.
Bennett versus Palmer in Superbrawl.
Ruas vs Varlens was good for its time.
Royce/Kimo
Tank x Taktarov
Renzo x Sakuraba
Belfort x Sakuraba
Serra x Carter
Pele x Macaco I
Frye x Goodridge I
Frye x Coleman I
Mino x Fedor I
Mino x Herring I
Couture x Rizzo I
Royce x Kimo
Couture x Randleman
Some of my personal favorites:
Mino vs Coleman
Mino vs Herring I
Mino vs Sapp
Silva vs Saku I
Silva vs Hendo
Silva vs Rampage I+II
Royce vs Shammy I
Royce vs Severn
Vitor vs Tank
BJ vs Hughes