Erison Danilo celebated his first start in the Primeira Liga by firing Estoril to a 1-0 victory in Vizela.
Milutin Osmajic missed a chance the equalise after being given a soft penalty, the hosts' task made tougher when Tomás Silva was sent off in the 73rd minute.
Vizela battled hard with 10 men, Alexander Schmidt spurning a great chance in added time but failing to beat Dani Figueira from close range.
Boavista have climbed up to fourth in the Primeira Liga table after a 2-1 turnaround away to nine-man Arouca pushed them above high-flying Portimonense on goal difference.
The Portuguese Primeira Liga has been going strong for six round, and Benfica’s perfect 6/6 record has left the last two winners of the championship title already playing catchup. Indeed, Roger Schmidt’s side have won 11 out of 11 games in all competitions, with Eagles fans excited at what they see as a real prospect of ending a three-year trophy drought.
Braga suffered a late scare in Vila do Conde, holding on to secure a 3-2 victory against Rio Ave to make it six straight wins.
A fascinating subplot underpins the Champions League Group D encounter between Sporting Clube de Portugal and Tottenham Hotspur in Lisbon on Tuesday evening.