12.05pm It's been a session of milestones, memories, and a slice of history for South Africa. Wiaan Mulder, unbeaten on 264 overnight, has extended his domination, surging past a monumental triple-century - only the second South African to do so - and now within touching distance of Brian Lara's Mount 400.

Mulder's triple came off just 297 balls, making it the second-fastest triple century in Test history, behind Virender Sehwag's famous 278-ball effort against South Africa in Chennai in 2008. During the course of his knock, he's gone past several famous names: Cullinan, Kirsten, de Villiers, Smith, Amla. And from the world game, Sobers. Every ball, every over has brought with it some milestone or the other.

Zimbabwe picked up two wickets in the first hour of play, but they'll probably be lost even in the footnotes. Because they've been at the receiving end of some of the most sublime batting. Join us in 30 minutes to see if Mulder does indeed break the world record.