Well, what a day of cricket.

297 runs have been scored. 15 wickets have fallen.

Australia started out by making a serious statement with the ball, but then South Africa hit back with the ball themselves.

Australia are only 7 runs behind with five wickets in hand and, most crucially, Travis Head still there on 78 from 77 balls.

Those two late wickets certainly help boost South Africa's hopes, because if Smith and Head were still there together at the close, things might have been a bit tougher.

But there's only one of that partnership now, but it is Travis Head.

He looked like he's been playing a different game to everyone else so far, but almost everyone else has struggled.

Only two partnerships of note across the one and a half innings, one of 98 between Temba Bavuma and Kyle Verreynne, and one of 117 between Head and Steve Smith.

This match is very much in the balance - but I can't see it going five days.