Guimaraes came from two goals down in the final 10 minutes to claim a 2-2 draw with Estoril on Saturday.
Both teams entered the contest looking for their first win of the season, with Estoril looking poised to claim all three points after a sixth-minute goal from Lica and another from Bruno Miguel early in the second half.
But Guimaraes was able to claw back into the game in the 82nd minute as Mahamadou N'Diaye found the back of net before Joao Ribeiro fired home the equalizing goal five minutes into added time.
Also on Saturday, FC Porto secured a 3-2 win at Olhanense despite falling behind in the 13th minute to a goal from Liban Abdi.
The defending champions were back on level terms shortly before the break through James Rodriguez, while Jackson Martinez made it 2-1 to Porto early in the second half.
Hulk stretched the lead to 3-1 before Olhanense got a consolation goal from Tiago Targino four minutes from time.
Sunday's action saw Braga drop a 2-0 contest at Pacos Ferreira as Javier Cohene and Paolo Hurtado scored for the hosts, while Beira Mar and Moreirense played to a 1-1 draw as a second-half goal from Beira Mar's Saleh canceled out a first-half strike from Ricardo Pessoa.
Gil Vicente was involved in its third straight 0-0 draw on Sunday as its match with Setubal failed to produce a goal, Rio Ave and Academica finished 0-0, and ���scar Cardozo scored twice to lead Benfica over Nacional, 3-0.