The victory leaves Benfica on 71 points after 32 games, five behind leaders Porto.
Primeira Liga: Benfica blow chance to open up lead on Porto with home draw; bus stoned after game injuring two players
Portuguese champions Benfica missed the chance to move clear of title rivals Porto as they were held to a 0-0 draw at home to lowly Tondela in their first game back after the top-flight season was disrupted by the COVID-19 pandemic.
All matches are being played behind closed doors but videos posted on media websites showed an estimated 200 Porto fans gathering behind barriers outside the stadium, singing and waving flags.
Ruben Dias to Carlos Vinicius: Five players to look out for when Portuguese football season restarts
Here are five to watch out for when the top-flight Portuguese Primeira Liga resumes on Wednesday after being disrupted by the COVID-19 pandemic.