Sporting Lisbon were forced to settle for a draw in their opening match of the new Liga season after conceding a last-minute equaliser at Academica.
A 15th-minute strike from Andre Carrillo has looked set to give Sporting all three points, despite last season's runners-up losing sought-after Portugal midfielder William Carvalho to a red card in the 66th minute.
But, with time almost up, Sporting were stunned by a Rafael Lopes equaliser as Academica - who lost 4-0 in last season's corresponding fixture - snatched an unexpected point with a 1-1 draw.
In Saturday's other match, Guimaraes kicked their season off with a 3-1 win at Gil Vicente. Goals from Hernani Fortes (37), Bernard Mensah (60) and Hernani Fortes (82) put Guimaraes in control and Gil Vicente could only respond through Evaldo's 87th-minute strike.