What was the best rivalry in MMA?
Pele- Macaco
Tito- Shamrock (Lion's Den)
Sakuraba- Gracie's
Silva- Jackson
Liddell- Couture
Liddell- Tito
BTT- Chute Boxe
Trigg- Hughes
Sakuraba vs the Gracies is my favourite followed closely by the BTT vs Chute Boxe rivalry
What's yours??
Barnett/ Dana White
Sakuraba vs the Gracie family was the best by far
1) Chuck vs Tito
2) Sakuraba vs Gracies
My favorite one-fight rivalry Fedor/CroCop. 
wanderlei/rampage
Tito and Chuck.
I remember seeing UFC 47 live on Pay-Per-View. There was a special sort of feeling to that fight that you can't really describe.
I don't think a fight since has had that sort of buzz around it, that wasn't manufactured through fake dislike a la Rampage and Evans.
Sak vs The Gracie Family
No Chute Boxe/Hammer House?
Saku - gracies
Chael - black house
Bisping - 'Merica
BJJ vs Luta Livre
Leben - Thacker's bed
Couture/Liddell for me.
CRBMoney14 - No Chute Boxe/Hammer House?
this.
Zen - 1) Chuck vs Tito
2) Sakuraba vs Gracies
This
Tito vs Shamrock (UFC 40)
Tito vs Liddell
There are tons more but Tito, Ken, and Liddell know how to seel fights so these rivalries stick out the most.
How can I forget... "What was the best rivalry in MMA?"
PRIDE vs UFC !!!
What about Don Fry & Ken Shamrock?!!
Ferg and Ox Doc
Carlson Gracie boys vs Helio Gracies boys
nova uniao vs gracie barra
I knew I would forget a couple. Yes, Hammer House/ChuteBoxe should have been listed as well as Penn/Hughes