Title chasers Pegasus suffered their biggest defeat in the BMA First Division when they were thrashed 4-1 by Citizen at Siu Sai Wan Sports Ground last night. They remain second in the standings on 25 points, four behind South China. 'We definitely under-performed,' Pegasus coach Ricardo Rambo said. 'I told the players this would be an important match, one we could not afford to lose, so I am disappointed. The way ahead will be very difficult now. We have to hope South China drop points; at the same time we cannot lose any more matches.'