Stranraer were knocked off top spot in Scottish League One after a 1-0 defeat at lowly Stenhousemuir.Home midfielder Josh Watt did the damage with the winner in the 20th minute.Anthony Marenghi ran towards the Stranraer defence and played in Watt, whose shot took a deflection as it flew past goalkeeper David Mitchell.Paul McMullan had two chances to double the hosts' lead but missed the target on both occasions.Stephen Stirling fired wide for Stranraer and after the break Craig Pettigrew was denied by keeper Greg Fleming.Morton's 4-0 win over Stirling sent them to the summit at Stranraer's expense.