The 43-year-old Englishman, who won his first title on tour in 2001 at the Scottish PGA Championship, could move as high as 14th in the world ranking on Monday, up from 27th.
Making the most of good scoring conditions in the morning, Coetzee started with two birdies and picked up three more shots from the sixth hole to surge ahead as he reached the turn in 31.
British Prime Minister Boris Johnson met French President Emmanuel Macron at the Elysee Palace a day after talks in Berlin with German Chancellor Angela Merkel, pressing them to accept his request to reopen Brexit negotiations.
Forces of Libyan strongman Khalifa Haftar bring down the plane south of Libyan capital, witnesses and Libyan National Army say, as head of internationally recognised government, Fayez al Sarraj, kicks off EU tour to drum up support.
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