Belenenses and Vitoria Setubal both failed to secure the win that would have aided their efforts to move away from the bottom of the Portuguese Liga as they played out a goalless draw in Monday night's only fixture.
Belenenses remain in the bottom three with just 11 points from 15 games, level with Leixoes and Olhanense.
They are still one point from safety as the team in 13th are Monday night's opponents, Vitoria. They move onto 12 points from 15 games following the draw.
Braga are the surprise league leaders at the half-way stage of the season, although free-scoring Benfica are joint top on 36 points.