Defending champions Boca Juniors will take on Union in the Argentine Primera Division opener on Friday at the Estadio 15 de Abril.The Xeneizes played out a goalless draw in their last match against Atletico Mineiro in the Copa Libertadores on Tuesday. Having won the league four times since 2015, the Juniors will look to start their 2021 campaign on a positive note with a win.Boca Juniors have registered a record of two wins, two draws, and a loss in their last five matches.Meanwhile, this fixture will be Union's first competitive game since May 10th. Union finished fourth in relegation Group 'A' last season, and manager Maroun Basil will have the responsibility of shepherding to a playoff berth this time around.Union vs Boca Juniors Head-to-HeadUnion and Boca Juniors have faced off on 13 occasions, with the latter prevailing in five of those encounters. Union have seven wins against Friday's rivals, while one game ended in a draw.The two sides last played in May 2021, in a game which Union won by a narrow margin of 1-0. Nicolas Penailillo scored the only goal of the game in the 50th minute.Union form guide: D-W-D-L-WBoca Juniors form guide: D-L-W-D-WAlso Read: Fabrizio Romano's Transfer Roundup: Manchester United pushing for 2 more transfers, Barcelona's plans for Lionel Messi, and moreUnion vs Boca Juniors Team NewsUnion Mauro Luna Diale is out with a meniscus rupture. All other players will be available for selection.Injured: Mauro Luna DialeDoubtful: NoneSuspended: None🔜 Próximo objetivo: Torneo LPF 2021.🆚️ Unión. #VamosBoca 🟦🟨🟦 pic.twitter.com/vHC8WmSV0t— Boca Juniors (@BocaJrsOficial) July 14, 2021Boca JuniorsFrank Fabra is on compassionate leave following his father's demise. Eduardo Salvio continues to recuperate from a cruciate ligament injury. Agustin Almendra is out with an ankle problem, while Carlos Zambrano won't be able to feature because of illness.Injured: Eduardo Salvio and Agustin AlmendraDoubtful: NoneSuspended: NoneUnavailable: Frank Fabra and Carlos ZambranoUnion vs Boca Juniors Predicted XIUnion predicted XI (3-5-2): Sebastian Moyano; Franco Calderon, Juan Carlos Portillo, Claudio Corvalan; Federico Vera, Martin Canete, Gaston Comas, Imanol Machuca, Nicolas Penailillo; Juan Manuel Garcia, Kevin Zenon#CuentaRegresiva para la #Reserva ⚽️Este viernes desde las 10.00hs el equipo de Marcelo Mosset recibe a @BocaJrsOficial en La Tatenguita.⚖️ Gonzalo Creimerman será el árbitro del encuentro, en tanto que los asistentes serán Xavier Arguello y Sebastián Punetti Canosa. pic.twitter.com/gCmtYnUqR5— Club Atlético Unión (@clubaunion) July 15, 2021Boca Juniors predicted XI (4-3-3): Agustin Rossi; Marcelo Weigandt, Carlos Izquierdoz, Marcos Rojo, Agustin Sandez; Diego Gonzalez, Esteban Rolon, Cristian Medina; Cristian Pavon, Norberto Briasco, Sebastian VillaUnion vs Boca Juniors PredictionUnion are unbeaten in their last five home games and will fancy their chances of an upset on Friday. Boca Juniors go into the game as favorites, but it will certainly be difficult for the visitors to get past a solid Union defense.We predict that Union will win the game by a narrow margin.Prediction: Union 1-0 Boca Juniors