World No . 1 Rory McIlroy toils on the opening day of the BMW PGA Championship . Northern Ireland hurls well at one stage as he cards a round of two - over - par . Luke Donald can usurp McIlroy 's top spot this week and he sits on four - under . Scotland 's David Drysdale and Ireland 's Peter Lawrie lead on six-under after day one with England 's Justin Rose and Alavaro Quiros , from Spain , in a group of five players one shot back . Ian Drysdale and Peter Lawrie lead after the first day on four - under .
World No . 1 Rory McIlroy toils on the opening day of the BMW PGA Championship . Northern Ireland hurls well at one stage as he cards a round of two - over - par . Luke Donald can usurp McIlroy 's top spot this week and he sits on four - under . Ian Drysdale and Peter Lawrie lead after the first day on four - under .