While George St. Pierre solidified his position atop the welterweight division with a victory over Matt Serra, with six middleweight bouts UFC 83 had the biggest impact on the 185 lbs weight class.
- [#17] Demian Maia, [#18] Jason MacDonald, and [#20] Jason Day all blasted into the Top 20 with impressive stoppage wins.
- Michael Bisping made his middleweight debut at #30.
- Nate Quarry improved to #49 with a lopsided decision over Kalib ‘Running Man’ Starnes.
- [#50] Ed Herman, [#53] Joe Doerksen, [#57] Alan Belcher all fall to the bottom half of the Top 100. Starnes falls to #80.
- [#5] Rich Franklin’s victory over [#41] Travis Lutter had no significant impact on either man’s rank.
- Former #99 Evan Tanner is displaced from the Top 100.
In the lightweight division, Mac Danzig makes his 155 lbs debut at #33. Mark Bocek drops out of Top 100, while Rich Clementi and Sam Stout sit at #24 and #35 respectively after their bout.
In the official Fight of The Night, Jonathan Goulet improved to #25 in the welterweight division with a KO victory over Kuniyoshi Hironaka. Hironaka falls to #61.