The #4 ranked Lamas tipped the scales at 145.5 for the bout, while the #1 contender Mendes came in at the same weight.
All of the fighters booked to fight tomorrow made weight, except for Jorge Masvidal, who was 156.5 on his initial attempt. The lightweight, who is scheduled to fight fellow contender Al Iaquinta in the co-main event, has two hours to lose the extra weight.
Here are the weigh-in results for Saturday’s event, which will be hosted by the Patriot Center.
UFC FN 63
Main Card (FOX Sports 1, 1 PM/ET)
Chad Mendes (145.5) vs. Ricardo Lamas (145.5)
Al Iaquinta (155.5) vs. Jorge Masvidal (156.5)
Michael Chiesa (155.5) vs. Mitch Clarke (155)
Milana Dudieva (135.5) vs. Julianna Pena (136)
Clay Guida (146) vs. Robbie Peralta (145)
Diego Ferreira (155.5) vs. Dustin Poirier (155.5)
Preliminary Card (FOX Sports 1, 11 AM/ ET)
Liz Carmouche (134.5) vs. Lauren Murphy (135)
Gray Maynard (155) vs. Alexander Yakovlev (155.75)
Shamil Abdurahimov (255) vs. Timothy Johnson (263.5)
Ron Stallings (185) vs. Justin Jones (185.5)