Aug 3 (Reuters) - Northern Ireland's Rory McIlroy replaced Australia's Adam Scott as the world's top ranked golfer after winning the WGC-Bridgestone Invitational in Ohio on Sunday. McIlroy, 25, took the world number one ranking for the fifth time, replacing Scott, who had held top honours for 11 weeks. (Reporting by Gene Cherry in Raleigh, North Carolina; Editing by Peter Rutherford) More...