DOHA: Duhail produced a landslide 6-1 victory over Al Kharaitiyat in the third round of the Qatargas U-23 League at Grand Hamad Stadium.     Despite a strong set of defenders in the Al Kharaitiyat side, Duhail took the lead through Sultan Al-Barik in the 25th minute.     Muntari scored the second and third goals for Duhail in the 46th and 52th minutes.     Abdul Rahman Mohammed (74), Mohammed Hussein (80, p) and Nasser Khaled (92) added the tally of goals for Duhail.     Meanwhile Al Sadd suffered their first defeat in a 2-3 loss to Al Sailiya at Grand Hamad Stadium.     Al Sadd opened the scoring in the 17th minute through Hassan Ahmed and two minutes later, Saud Al-Nasr added the second goal.     Saeed Al-Marri (27, p and 37) scored the goals for Al Sailiyah.     In another match, Al Ahli posted their first win of the season when they beat Al Gharafa 2-1 at Al Sailiya Stadium.     Al Ahli's Ali scored the first goal in the 17th minute.     Al Gharafa managed to equalize through  Mohammed Ismael. Al Ahli then scored the winner in the 57th minute.