LAHORE - Khan Research Laboratories (KRL) had to work overtime to displace the challenge of high-spirited Pak Elektron Limited (PEL) as they forced their way to the quarter-finals with 1-0 win at Peoples Sports Complex, near Wazir Mansion Railway Station . Meanwhile, Sheldon Road's KMC Stadium saw 1999 national championship runner-up Navy had moving into last four with identical 1-0 scoreline against PAF in all-services affair. Both the matches were belong to Group-A and after the completion of four matches KRL and Navy mustered six points while eliminated teams PEL and PAF yet to open their account. PAF, who won the National Championship in 1986 and finished runner-up to Frontier Scouts in 9th National Football Challenge Cup in 1994, is now Tier-II team of Pakistan -  having missed the top two slot in Super Six of PFF League 2007 at their own stadia. They once again made early exit from an event of PFF calendar. The airmen surprised the seamen by holding them to half-time and further 25 minutes in second session until Navy's speedy winger Asif  Mehmood hammered the all-important goal in the 70th minute. At Peoples Stadium, the Rawalpindi-based team, who finished runner up twice in the event on either side of 2000 at Chaman and Bahawalpur, went to distance in the first-ever meeting between KRL-PEL in PFF's events. They fielded their skipper Muhammad Essa who was unfit when KRL edged out PAF 2-0 on opening day. Despite Essa's presence, it was penalty-spot that gave KRL's the winning goal against the debutant from Lahore. KRL held the upperhand in the match but their front-runners were not in proper mood to create chances in PEL's defence. PEL, who will be among A-Division teams in Pakistan Premiership 2008, had three real chances in the first half but wayward shooting tarnished their image.  The first half ended 0-0. PEL won the hearts of fans with their stubborn effort but they crumbled eleven minutes from final whistle. Famous Karachi-based referee Yunus Lal penalised a handball infringement and pointed to the penalty-mark. Quetta-born midfielder Shahid Ahmed, SAF Games Gold medallist two years ago at Sri Lanka, went up and slotted the ball past keeper's outstretched hands. MONDAY (5 MAY) FIXTURE KPT v HBL (4.30 PM : Group-C  at Peoples Stadium), NBP v SSGC (4.30 PM - Group-B  at KMC Stadium).