MELBOURNE, AUSTRALIA - JANUARY 15: Mohammad Amir of Pakistan celebrates after dismissing Mitchell Marsh of Australia during game two of the One Day International series between Australia and Pakistan at Melbourne Cricket Ground on January 15, 2017 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

Ahead of Thursday's third ODI between Australia and Pakistan in Perth, Aussie coach Darren Lehmann says his batsmen need to stand up to the challenge and perform better out on the pitch.

Scores of 9/268 and all out for 220 over the first two ODI's have seen Australia fail to put away the tourists, with Matthew Wade's century in the opening match of the series a big factor in the side's ability to score over the 200 mark.

Mitch Marsh was replaced in the side by debutant Peter Handscomb after Marsh suffered a shoulder injury during the second ODI, and the newcomer will be looking to impress as soon as possible, as Lehmann is asking for his top order to step up and perform.

"We got saved by Matthew Wade in Brisbane when we were in trouble, so to have the top four or five do all the batting in this game will be good," the coach said.

"It was an optional (training) session (today) and the guys have been going for five months on the bounce, so to give them a day off occasionally is good heading into the back three games.

"They've been training really well. You can only do so much training, they've got to do it out on the park. So we're making sure they're fresh and ready to go.

"The batters know what they want to do, they know how they want to do it. It's just a matter of implementing it out there."

With Australia's batting woes in the series so far, some credit needs to go to Pakistan, as the Pakistani bowling attack looked strong in both Brisbane and Melbourne.

Pacemen Mohammad Amir and Junaid Khan have led from the front, while spinner Imad Wasim has taken crucial wickets in both ODI matches.

"I don't know about the past but in the last two games our bowlers have done a really great job for us," said captain Mohammad Hafeez on Australia's batting troubles of late.

"They took wickets at the right time and they put the opposition under tremendous pressure. We believe we can take three or four wickets early on, which gives you more of a chance to attack.

"That's what our bowlers have done in the last two games and we'll try and maintain the same aggressive attitude."