Warner: We have to accept umpire's decision

Cape Town - One of the major talking points from Friday's second day of the first Test between Australia and South Africa in Perth was Steve Smith's dismissal. 

Dale Steyn's injury and the Proteas' phenomenal bowling performance stole headlines, but Smith's wicket was a significant moment in the collapse. 

The Aussie captain came down the track - 2.8 metres down the track, to be precise - to rookie spinner Keshav Maharaj and was hit on the pad when he missed the ball.

Umpire Aleem Dar, to the surprise of everyone, gave Smith out. 

The decision was reviewed, but DRS suggested it did not find enough evidence to have it overturned, so it stood. 

Smith was out for 0 and he was visibly furious that he had been given out after having run so far down the wicket. 

But, speaking after the day's play, Aussie opener David Warner was far more calm than his captain.

"At the end of the day we have to accept the umpire's decision," Warner said.

"It's quite tough to bite your tongue and walk when you feel like you're not out or you've played a poor shot.

"But at the end of the day we know that the umpire is given you out then you're out and you have to go."