Key batsman Denesh Ramdin
One of the reasons there has been so much scorn about the West Indies' batting across the first two Tests was the paltry contributions of the two most senior players, Denesh Ramdin and Marlon Samuels. Wicketkeeper Ramdin came into the series having not reached 50 since   April 2015, against England in Antigua, and had been averaging a paltry 10 since losing the captaincy after the   June series against Australia. 
Key bowler Mitchell Marsh
The all-rounder did not get any further opportunity to impress with the bat so it was left to him using the ball to demonstrate why Darren Lehmann and Australia's hierarchy are so keen to retain him. He was brought into the attack in the 13th over and immediately bowled with admirable hostility, and conspicuously quicker than Peter Siddle. That trait was also influential in him breaking through late in the middle session. Marsh's short deliveries had Samuels camped on the back foot, and when he remained there when attempting to block a fuller delivery it cost him his wicket as he edged behind. He also broke the century partnership between Denesh Ramdin and Jason Holder just before the second new ball. He removed both batsmen who shared in the visitors' first and only century partnership of the series so far.
Key moment
When Australia entered the 70th over without yet making a challenge there was little to lose when initiating one against a failed leg-before appeal by Peter Siddle against Jason Holder. While the immediate footage suggested there was little chance of success, due to the trajectory beyond leg stump, the delay to confirm this with Eagle-Eye became longer and longer. The wait did not end. A glitch meant the ball-tracking system was unavailable, ensuring Marais Erasmus' decision stood.
Key numbers
1474: Steve Smith's decision to declare at Australia's overnight score of 3-179 meant that is what his 2015 Test run tally ended at, with an average of 73.7. It gave him a 102-run buffer to second-placed Joe Root of England, who was due to resume in Durban on 60.
164.2: Mitch Starc was unimpressed in Perth when the accuracy of speed gun, after he was clocked at 160.4km/h, was questioned by New Zealand batting coach Craig McMillan. Spinners Mark Craig and Nathan Lyon have also been clocked at pace-like speeds. When steady Josh Hazlewood was clocked at 164.2km/h on Tuesday, fringe Australia all-rounder Daniel Christian took to Twitter to add his disapproval: "How's that radar gun going this year?"
35: The West Indies' highest opening partnership in their 10 Tests this year.