Benfica travelled north and were relieved to secure all three points against a resurgent Boavista outfit whilst Sporting had former Manchester United favourite Nani to thank for victory against Vitória de Setúbal.
Champions FC Porto had a nervy opening at Belenenses temporary home, the Estádio Nacional, before Diogo Leite headed home from a corner midway through the first-half.
A minute after the interval and Porto were two up.
A dreadful back pass by Dálcio allowed Otávio to nip in, round the keeper and tuck the ball into an empty net.
These days Belenenses are made of sterner stuff and less than ten minutes later Fredy reduced the arrears from the spot.
Game on. The Lisbon outfit then levelled matters when Keita found the back of the net with a back-post header seven minutes from time.
The home side could justifiably feel aggrieved to concede a penalty deep into stoppage time which Alex Telles slotted home to deny Belenenses a point.
Benfica made the trip to Porto to play Boavista knowing that they had only beaten them once in their last four meetings.
Jonas was still missing through injury and it was left to his deputy Ferreyra to draw first blood ten minutes before the interval.
Dispossessing two Boavista defenders on the edge of the box the Argentinean, a summer signing from Shakhtar Donetsk, finished clinically into the far corner of the net.
Fifteen minutes after the break Pizzi added a second to bring his tally to four goals in two games.
The Portugal international nearly grabbed his second when he raced through a static Boavista defence in the closing minutes but Helton was up to the task and diverted Pizzi wide for a corner to keep the score at 2-0.
After a summer of turmoil Sporting notched up a 2-1 victory over Vitória de Setúbal at the Alvalade.
It was a sentimental homecoming for manager José Peseiro and Nani who gave the Lions an early lead with a strike from outside of the box which beat Cristiano at his near-post. Setúbal were soon back in the game when Sporting keeper
Romain Salin’s error allowed Zequinha to finish into an empty net.
Sporting turned to Fredy Montero and Jovane Cabral for inspiration in the second period and it was Cabral who crossed from the right to set up the winning goal.
The Cape Verdean picked out Nani who made no mistake in powering his header past Cristiano.
Portimonense lost 2-0 at Chaves and are the only team yet to score a goal in the league. They will have a chance to make amends when they entertain newly promoted Santa Clara (Azores) at the Portimão Municipal Stadium on Saturday kick-off 4.30pm