Doha: Qatar defeated Singapore in a fooball friendly match at Al Duhail Stadium in Doha on Thursday.   Qatar coach Felix Sanchez opted to rest a host of his regular players including Almoez Ali, Pedro Miguel, Boualem Khoukhi and Tarek Salman, but that did not stop the Asian champions from taking the lead in the 32nd minute through Mohammed Muntari.   An own goal from Shahdan bin Sulaiman 11 minutes later gave Qatar a two-goal lead which they never relinquished.   With the Gulf Cup just 10 days away, the match was good opportunity for Sanchez to test his bench strength and the Spaniard would be happy with the way his players responded.   Qatar take on Afghanistan in the 2022 World Cup and 2023 AFC Asian Cup joint qualifying match in Tajikistan on November 19.   Qatar have played four matches and won three - they have beaten Afghanistan 6-0, Bangladesh 2-0 and Oman 2-1 while playing out a goalless draw against India - to lead Group E with 10 points.