The first legs of the Primera División B semifinals ended in 0-0 draws. Armenio tied with Argentino de Merlo in Ingeniero Maschwitz, while Acassuso drew against Real Pilar in Boulogne. Both matches were marked by a lack of goals and numerous cautions.
In semifinal 1, Armenio and Argentino de Merlo played at the Armenia stadium in Ingeniero Maschwitz at 17:00, broadcast on TyC Sports and TyC Sports Play. Referee Julián Jerez oversaw a tense match that ended 0-0, with Armenio holding 60% possession against 40%. There were no shots on goal for either side, but Armenio received 6 yellow cards and Argentino de Merlo 3, plus 2 red cards each in the second half: Iván Cardozo and Nahuel Sica for Armenio (43' and 31' ST), and Juan Bautista Sánchez de León and Juan Manuel Sánchez de León for Argentino de Merlo (44' and 37' ST). Substitutions included Santino Lagomarsino for Jonathan Herrera in Armenio (46' ST) and Cristian Medina for Gastón Scisci in Argentino de Merlo (33' ST).
In semifinal 2, Acassuso and Real Pilar met at the La Quema stadium in Boulogne, also at 17:00 on DGO. Under referee Wenceslao Meneses, the game finished 0-0 with 45% possession for Acassuso and 55% for Real Pilar, and no shots on goal. Acassuso had 3 yellows (Alex Ruiz 10' PT, David de Estefano 33' PT, Joel Ghirardello 25' ST) and Real Pilar 1 (Mathías Crocco 27' ST), with no reds. Key substitutions: for Acassuso, Jonathan Raccio for Agustín Hermoso (42' ST) and Bruno Miño for Lucas Rey (30' ST); for Real Pilar, Nicolás Vidal for Martín Gómez (40' ST) and Luis Monge for Darío Leguiza (30' ST).
The return legs are set for December 10: Armenio vs Argentino de Merlo at 20:00 in Juan Carlos Brieva stadium, and Acassuso vs Real Pilar at 20:30 in Municipal de Pilar. These draws leave the finalists undecided.