Ghanaian forward Mohammed Muntari scored for Al Duhail as they defeated Al Sadd to go top of the 1st Qatar Stars League.
Muntari scored in the 34th minute from the spot to level Hassan Al-Haydos' early lead for Al Sadd.
Karim Daif doubled Al Duhail's lead through a first-half injury time goal before Brazilian midfielder Paulo Edmilson bagged his side's third goal in the 81st minute.
Moaaz Ali completed the riot with a goal, one minute from end.
The win sees Al Duhail go top of the league table with 23 points from nine matches, and along with second-placed Al Rayyan, 21 points from 9 matches, are the only unbeaten team so far in the competition.