UFC 86: Jackson vs. Griffin was held by the Ultimate Fighting Championship (UFC) on July 5, 2008, at the Mandalay Bay Events Center in Las Vegas, Nevada.
The card was headlined by a welterweight championship bout between champion Georges St. Pierre and challenger Jon Fitch. UFC Hall of Famer Mark Coleman was supposed to fight Brock Lesnar, but an Achilles tendon injury forced him to withdraw. Heath Herring stepped in to fight Lesnar instead.
Post UFC 87 Notes by N. Bailey
| Match | Winner | Loser | Method | Round | Time |
| 1 | Ben Saunders | Ryan Thomas | Submission (Armbar) | 2 | 2:28 |
| 2 | Chris Wilson | Steve Bruno | Decision (Unanimous) | 3 | 5:00 |
| 3 | Jon Jones | Andre Gusmao | Decision (Unanimous) | 3 | 5:00 |
| 4 | Cheick Kongo | Dan Evensen | TKO (Strikes) | 1 | 4:55 |
| 5 | Tamdan McCrory | Luke Cummo | Decision (Unanimous) | 3 | 5:00 |
| 6 | Demian Maia | Jason MacDonald | Submission (Rear-naked Choke) | 3 | 2:44 |
| 7 | Kenny Florian | Roger Huerta | Decision (Unanimous) | 3 | 5:00 |
| 8 | Robert Emerson | Manvel Gamburyan | KO (Punches) | 1 | 0:12 |
| 9 | Brock Lesnar | Heath Herring | Decision (Unanimous) | 3 | 5:00 |
| 10 | Georges St. Pierre | Jon Fitch | Decision (Unanimous) | 5 | 5:00 |
Weigh-In Results:
Jon Fitch (170) VS Georges St-Pierre (170)
Heath Herring (250) VS Brock Lesnar (265)
Roger Huerta (155) vs Kenny Florian (155)
Demian Maia (185) VS Jason MacDonald (185)
Robert Emerson (155) VS Manvel Gamburyan (155)
Tamdan McCrory (170) VS Luke Cummo (167)
Dan Evensen (244) VS Cheick Kongo (235)
Andre Gusmao (205) VS Jon Jones (205)
Steve Bruno (170) VS Chris Wilson (170)
Ryan Thomas (170) VS Ben Saunders (170)