Sporting were held to a goalless draw at the Alvalade thanks to some physical defending and a disallowed goal.
Leonardo Jardim started with the same team that beat Belenenses but they found this game much more difficult.
The first half in particular was full of late tackles as Sporting struggled to create. Referee Manuel Mota ignoring some of the more physical challenges made by Nacional players.
The best chance of the first half for Sporting was through an André Martins freekick that forced Eduardo Gottardi into a good save.
The first half finished goalless and Leonardo Jardim was forced into a chance after André Martins picked up a knee injury. Islam Slimani came on to replace him as Sporting went to try a more direct route to goal.
The big moment of the match came in the 65th minute when Islam Slimani had a legitimate goal wrongly disallowed. A Cédric Soares cross found the Algerian pulling away from his marker to head in but Manuel Mota had other ideas. The referee may have given a foul for an early altercation with Fredy Montero but if so then he blew his whistle very late.
Sporting though couldn’t find another way through and lacked some of the creativity that André Martins would have provided had he not been injured.
The result means that Sporting, Benfica, and Porto are all tied first in the league with Sporting top due to a superior goal difference.
SPORTING XI: Rui Patrício; Cédric Soares (YC), Maurício, Marcos Rojo, Jefferson (YC); William Carvalho, Adrien SIlva, André Martins (Islam Slimani, 45′); André Carrillo (Wilson Eduardo, 68′), Diego Capel (Carlos Mané, 84′, YC), Fredy Montero (YC)
Substitutes Not Used: Marcelo Boeck, Eric Dier, Vítor Silva, Gérson Magrão