Khawaja explains why Australia batted again

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Usman Khawaja defended Australia's decision not to enforce the follow-on once again after they closed in on victory in the first Test against Pakistan.

The tourists were skittled out for just 142 in reply to 429, but Australia captain Steve Smith opted against putting them back in on day three.

Khawaja top scored with 74 and first-innings centurion Smith added another 63 in the day-night Test at The Gabba before declaring on 202-5 - leaving Pakistan needing a highly improbably 490 to win the first game of the three-match series.

Australia will fancy their chances of wrapping up an emphatic win on day four after Pakistan closed on 70-2 and Khawaja explained why they opted to bat again in Brisbane.

"We just wanted to bat normally for the first session we were out there," he said.

"We had a bit of trouble obviously getting those couple of wickets this morning, they batted pretty alright. We got there and tried to bat normally in the first hour, then see where we were and push the game along from there.

"It was really tough at the start. When I first came in, it was swinging conventionally, and it was swinging quite consistently for about seven or eight overs there I reckon,

"We knew we had to get through that tough period I reckon just before that break it stopped swinging, with all that I was trying to absorb the pressure - that was the time the left-armers were at their most dangerous.

"From there as the pink balls start softening you can start scoring."