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 .
World No . 1 Rory McIlroy toils on the opening day of the BMW PGA Championship . Northern Irishman hurls club at one stage as he cards a round of two-over-par . Luke Donald can usurp McIlroy 's top ranking this week and he sits on four-under . David Drysdale and Peter Lawrie lead after the first day on six-under .