Defending their lead with relative ease, a third goal looked on the cards and when Arsenal failed to clear a cross into the penalty area the ball dropped to Maroni, who expertly volleyed into the corner.
It’s too soon and Arsenal are too poor to read much into Maroni’s performance and Boca’s victory but the result will have eased some of the nerves beginning to build in La Bombonera and Guillermo Barros Schelotto’s side remain title favourites.
In Bahía Blanca, Olimpo’s survival bid took a real blow as the Aurinegro lost 2-1 at home to ten-man Atlético de Rafaela.
Atlético themselves are on the brink of relegation and scrapping for every point but when Teodoro Paredes was sent off just after Olimpo’s Carlos Rodríguez had cancelled out Fernando Luna’s opener, it looked as though there would be only one winner.
However, Gabriel Gudiño raced through on goal to reestablish the lead for La Crema’s ten men and they held on for all three points.