The South African entered round four at Heritage La Réserve Golf Club with a one-shot lead but soon saw that disappear as playing partner Jacques P de Villiers, England’s Laurie Canter and the charging Sebastian Söderberg all staked a claim.
It was nip and tuck over a dramatic back nine in the Indian Ocean but in the end Oosthuizen’s 69 was enough to hand him a two-shot victory over Canter at 17 under.
South African de Villiers, Swede Söderberg – who carded the lowest round of the day with a 63 – and England’s Daniel Brown finished at 14 under, one clear of South Africa’s Jayden Schaper.
Oosthuizen’s victory also saw Min Woo Lee crowned the winner of the Opening Swing, handing the Australian US$200,000 and a place in the second part of the DP World Tour season – the Back 9.
The triumph at the weather-delayed Alfred Dunhill Championship last time out was Oosthuizen’s first for five years but he now has two in six days, with this week’s coming over a course he co-designed with Peter Matkovich.
