KARACHI Imran Khan won three-set quarter final against Tayyab Yousuf in the 45 plus singles match in the 13th PSO Pakistan International Seniors World Ranking Tennis Championship here on Friday at Karachi Gymkhana. After two-and-half-hour gruelling contest, he won 6-2, 1-6, 6-1 for a place in the semis. Results: 45 plus singles remaining pre-quarter: Azheruddin beat Iltifat Ahmed 6-4, 3-6, 7-5. 45-plus singles quarter-finals: Imran Ahmed (3rd seed) beat Tayyab Yousuf 6-2, 1-6, 6-1, Israr Gul (KPK Police) beat Syed Muhammed Jalal 6-3, 7-5, Tahir Gul (top seed) beat Khwaja Masroor 6-3, 6-3. 35-plus singles quarter-finals: Rafi Derbari w/o Aamir Khokher, Arif Iftikhar beat Iftikhar Hussain (Peshawar) 6-3, 6-3. 35-plus singles semi-final: Hassan Mehmood beat Rafi Derbari (Hyderabad) 6-4, 6-4. 45 plus doubles first round: Akhter Aliman and Karim Gul beat Latif Yar and Afaq Ahmed 6-3, 6-3, Hanif Habib & Ronnie Dobash beat Noorullah Dhanani & Qamruddin 6-0, 7-6, Sabih Wali & Gul Hameed w/o Ahsan Abbasi & Khalid Mustaghees.