Sydney - Coach Gregor Townsend made eight changes to Scotland's starting line-up to face Australia on Saturday, including the return of 23-year-old lock Jonny Gray.
Scotland will field an entirely new front row and back three to the team that started in last weekend's 34-13 victory over Italy in Singapore.
A contentious omission from the British and Irish Lions' tour of New Zealand, Gray is known for attempting 85 tackles in the 2015 Six Nations campaign, and missing just one.
Townsend on Thursday said he deliberately kept Gray fresh to play the Wallabies, who ran in five tries in their season-opening 37-14 win over Fiji last Saturday in Melbourne.
"We've managed him for a reason to make sure he's ready to go for this game," Townsend said. "He's been a key player for Scotland the last two or three seasons. He's in great form. He can't wait to play." Gray will partner Australia-born Ben Toolis in the second row.
Townsend said he always planned to field a vastly different line-up for the Tests against Italy and Australia.
"We were always keen on this tour (to ensure) that players who were close to selection got an opportunity," he said. "A few of them got an opportunity last week and some do this week."
Scotland will conclude their three-Test tour next Saturday against Fiji in Suva.
15 Israel Folau, 14 Dane Haylett-Petty, 13 Tevita Kuridrani, 12 Karmichael Hunt, 11 Eto Nabuli, 10 Bernard Foley, 9 Will Genia, 8 Scott Higginbotham, 7 Michael Hooper (captain), 6 Ned Hanigan, 5 Adam Coleman, 4 Sam Carter, 3 Allan Alaalatoa, 2 Tatafu Polota-Nau, 1 Tom Robertson
Substitutes: To be announced on Friday
15 Greig Tonks, 14 Lee Jones, 13 Alex Dunbar, 12 Duncan Taylor, 11 Rory Hughes, 10 Finn Russell, 9 Ali Price, 8 Ryan Wilson, 7 Hamish Watson, 6 John Barclay (captain), 5 Jonny Gray, 4 Ben Toolis, 3 Zander Fagerson, 2 Fraser Brown, 1 Gordon Reid
Substitutes: 16 Ross Ford, 17 Allan Dell, 18 Willem Nel, 19 Tim Swinson, 20 Josh Strauss, 21 Henry Pyrgos, 22 Ruaridh Jackson, 23 Matt Scott