Esparza and Namajunas tipped the scales at 115 pounds for the main event, which will determine the promotion’s inaugural strawweight champion.
Two fighters did not make weight on their first attempts, however, as Aisling Daly and Charles Oliveira came in over.
The strawweight Daly weighed 118 for her fight with Alex Chambers, and Oliveira was 147 for his scrap with featherweight Jeremy Stephens.
Friday’s card will go down at the Palms Casino Resort. Here are the official weigh-in results.
Main Card (FOX Sports 1, 9 PM/ ET)
Carla Esparza (115) vs. Rose Namajunas (115)
Charles Oliveira (147)* vs. Jeremy Stephens (146)
Daron Cruickshank (156) vs. K.J. Noons (156)
Yancy Medeiros (155.5) vs. Joe Proctor (156)
Randa Markos (116) vs. Jessica Penne (115.5)
Preliminary Card (FOX Sports 1, 7 PM/ET)
Felice Herrig (115) vs. Lisa Ellis (115)
Heather Jo Clark (115.5) vs. Bec Rawlings (116)
Joanne Calderwood (116) vs. Seo Hee Ham (114.5)
Angela Magana (115.5) vs. Tecia Torres (115.5)
Preliminary Card (Fight Pass, 6 PM/ET)
Alex Chambers (114.5) vs. Aisling Daly (118)*
Angela Hill (115.5) vs. Emily Kagan (116)
*fighter has additional hour to cut weight