South Australia 1 for 178 (Weatherald 104*, Hunt 57) trail West Australia 5 for 481 dec (Inglis 153*, Agar 114*, Pope 5-164) by 303 runs

It wasn't a day to be a bowler at Karen Rolton Oval as 349 runs were scored with just one wicket falling. Ashton Agar and Josh Inglis both registered unbeaten centuries, in a Western Australia record sixth-wicket stand of 266, before Jake Weatherald led South Australia's strong reply with his seventh first-class hundred.

Western Australia resumed on 5 for 310 and after an early period of consolidation rattled along through Agar and Inglis who paced each other to their centuries which came in the space of three balls: for Inglis it was his maiden first-class hundred and for Agar his third.

Inglis brought out some of the strokeplay that has lit up the BBL for the Perth Scorchers and the latter part of the innings was distinctly T20 in its manner with Agar content to let his team-mate do most of the damage, including taking 20 off an over from Lloyd Pope which brought the declaration.

Agar's innings was a big start to the season for him after being given the allrounder's role in the absence of the injured Mitchell Marsh. With the debate currently ongoing about who might be Australia's second Test spinner behind Nathan Lyon, Agar's all-round package could be attractive as a way of balancing the side if he can build on this century, although like most bowlers on the day he found life tougher in the field.

After declaring midway through the afternoon, Western Australia toiled for their first breakthrough as Weatherald and Henry Hunt added an opening stand of 125. However, they should have removed Weatherald on 46 when he edged debutant Lance Morris to second slip where Ashton Turner spilled a regulation chance.

New signing Cameron Gannon eventually became the lone wicket-taker for the day when he had Hunt neatly caught a short mid-on, but there was no shifting Weatherald although Western Australia were confident they had him down the leg side off Agar on 66.

He slowed up a touch through the 90s and the clock was ticking down to the close of play when he worked Morris off his pads to fine leg to reach three figures from 155 balls.