Antes del evento UFC on ESPN 66, programado para el 27 de abril en Kansas City, los luchadores completaron exitosamente el proceso oficial de pesaje.
Peleas principales
Jian Machado Gary (171 libras / 77.56 kg) — Carlos Prates (171 libras / 77.56 kg)
Mingyan Zhang (206 libras / 93.44 kg) — Anthony Smith (206 libras / 93.44 kg)
Giga Chikadze (147 libras / 66.68 kg)* — David Onama (146 libras / 66.22 kg)
Abusupiyan Magomedov (185.5 libras / 84.14 kg) — Michel Pereira (186 libras / 84.37 kg)
Randy Brown (171 libras / 77.56 kg) — Nicolas Dalby (171 libras / 77.56 kg)
Ikram Aliskerov (185.5 libras / 84.14 kg) — Andre Muniz (185 libras / 83.91 kg)
Peleas preliminares
Jimmy Flick (126 libras / 57.15 kg) — Matt Schnell (126 libras / 57.15 kg)
Evan Elder (156 libras / 70.76 kg) — Gage Young (156 libras / 70.76 kg)
John Castaneda (146 libras / 66.22 kg) — Kris Gutierrez (146 libras / 66.22 kg)
Hailey Alateng (136 libras / 61.69 kg) — DaMon Blackshire (135.5 libras / 61.47 kg)
Cameron Saiman (135 libras / 61.23 kg) — Malcolm Wellmaker (135 libras / 61.23 kg)
Jacqueline Amorim (116 libras / 52.62 kg) — Polyana Viana (115.5 libras / 52.39 kg)
Timothy Kuamba (146 libras / 66.22 kg) — Roberto Romero (145 libras / 65.77 kg)
Chelsea Chandler (134 libras / 60.78 kg) — Joseline Edwards (136 libras / 61.69 kg)
Mateo Quintana