The Australian bogeyed the hole while his two rivals birdied, meaning he was virtually out of the running from that point on, but Leishman took the misfortune with good grace.
Zach Johnson is 39-years-old. All three made bogey on 17, again, no surprise, and after Johnson missed his birdie putt on 18, Oosthuizen had an opportunity to tie him and send the playoff to sudden death.
Yesterday, there was only flawless perfection. Nestled a few shots behind the leaders, he shrugged off the weather delay to shoot a second-round five-under-par 67, which might have been even better had a well-read putt at the Road Hole not come up fractionally short.