Academica have moved three points clear of the relegation zone in Portugal's Liga Sagres with a 1-0 win over fellow strugglers Moreirense.
Portuguese winger Marinho scored the only goal of the game as Academica picked up a crucial victory, while Gil Vicente also moved closer to safety with a 2-0 triumph in an old-fashioned relegation six-pointer against Olhanense.
In the 18th minute at Estadio EFAPEL in Coimbra, Marinho gave the home side the lead, sprinting onto a long through-ball in between Moreirense's two central defenders before producing a cool finish into the bottom corner.
Sunday's win took Academica to 24 points, three ahead of relegation-placed Moreirense, while Gil Vicente's victory took them four points clear of the drop zone.
Hugo Viera opened Gil Vicente's account in the 23rd minute and four minutes after half-time a penalty from Cesar Peixoto effectively ended Olhanense's resistance.
In other results, Sporting Lisbon needed an 85th-minute goal from Marcos Rojo to overcome Nacional 2-1, while Rio Ave defeated Beira-Mar 2-1 and Vitoria Guimaraes held Pacos de Ferreira to a 2-2 draw.