Diaz came in at 155.6lbs, which is .6 lbs over the limit for a lightweight title fight. In a typical fight, a fighter is given a 1lb allowance, but in a title fight both champion and challenger must come in at or under the weight class limit, in this case 155lbs.
Henderson made weight without issue, but Diaz will have to cut a little additional weight over the next 2 hours to make his title fight with Henderson official.
The loudest ovation for the weigh-ins came courtesy of B.J. Penn’s arrival to the stage, and as expected his opponent Rory MacDonald was greeted with a very loud chorus of boos from the Seattle faithful.
Two other fighters on the UFC on Fox 5 undercard also failed to make weight and will be given the same 2 hours to make the additional cut, or risk a penalty for not making weight.
UPDATE: On his third attempt on the scale, Nate Diaz hit the 155lb mark to make his title fight against Benson Henderson official.
UFC ON FOX 5 FULL WEIGH IN RESULTS:
Benson Henderson (154.6) vs. Nate Diaz (155)*
MAIN TELEVISED CARD FOR FOX:
Mauricio “Shogun” Rua (205) vs. Alexander Gustafsson (205.4)
B.J. Penn (168.2) vs. Rory MacDonald (170.2)
Mike Swick (170) vs. Matt Brown (170.2)
PRELIMS ON FX:
Jeremy Stephens (155.8) vs. Yves Edwards (155)
Raphael Assuncao (136) vs. Mike Easton (135)*
Ramsey Nijem (155.4) vs. Joe Proctor (154.6)
Daron Cruickshank (155) vs. Henry Martinez (158.8)*
Marcus LeVesseur (155.4) vs. Abel Trujillo (155.4)
Dennis Siver (146) vs. Nam Phan (145.4)
PRELIMS ON FACEBOOK:
Scott Jorgensen (135.2) vs. John Albert (136)
*2 hours to get down to the required weight
Raphael Assuncao was able to make weight on the second attempt. Henry Martinez was not able to make weight and will forfeit a percentage of his fight purse to his opponent.