Louis Oosthuizen leads Open Championship heading into final day News24 South Africa's Louis Oosthuizen carded a battling round of 69 to take a one shot lead into the final round of the Open Championship. The 2010 Champion had been peerless over the first two days at Royal St George's Golf Club and made serene progress over the first 10 holes of round three despite three-time major champion Jordan Spieth applying the pressure. The South African had to dig deep over the back nine to get to 12 under and as Spieth faltered down the stretch, American Collin Morikawa carded a 68 to emerge as Oosthuizen's closest challenger.