a sun—soaked sandwich and a day when being a golf fan was about as fun as it gets. when being a golf fan but while they basked in the heat, others were trying to keep their cool. after starting with a two—shot lead, louis oosthuizen began in his usual unflappable style. but soon he had company — another former champion, jordan spieth, piling on the pressure. and so did collin morikawa as three of them became locked in a thrilling battle. hopes of a home winner are fading. paul casey and the pinpoint—precise andy sullivan the best of the bunch. but they are seven shots back. while rory mcilroy is 11 back after a round which began promisingly before falling away. but at the top of the leaderboard, late drama. spieth missed a tiddler at the last and oosthuizen edged clear of morikawa. he's led after every round so far. could this once again be his year? and so louis oosthuizen takes a slender one—shot lead into the final day.