David Warner`s quickfire 87 not out was the centrepiece of Australia`s 132 without loss at lunch on the first day of their tour match against Derbyshire at Derby on Thursday.
Shaun Marsh was unbeaten on 39.
Left-hander Warner, who made 83 in the second innings Australia`s crushing 405-run win in the second Test against England at Lord`s on Sunday, which levelled the five-match Ashes series at 1-1, was rarely troubled after skipper Michael Clarke won the toss.
His one awkward moment came shortly after he had completed his fifty when teenage seamer Will Davis, making his debut, struck him in the groin.
But, after receiving some on-field attention, Warner batted on and shortly before lunch lofted off-spinner Scott Elstone for six.
At lunch, Warner had faced 92 balls including 11 fours.
Davis, 19, was the pick of Second Division side Derbyshire`s attack during an economical six-over spell costing 18 runs.
Marsh is in line to replace Chris Rogers, should the veteran opener be ruled out of next week`s third Test at Edgbaston.
Rogers succumbed to a sudden bout of dizziness at Lord`s on Sunday.
It had been thought the 37-year-old was a victim of delayed concussion, having been struck on the helmet by a bouncer from England paceman James Anderson on Friday`s second day at Lord`s.
But Cricket Australia said Wednesday that, following examination by a London-based specialist, Rogers was suffering a balance problem in the inner ear.
The first innings at Lord`s saw Rogers score a Test-best 173.
Rogers, who is to have further tests in London, was not scheduled to play against Derbyshire in any event.
Australia included both their wicket-keepers, Brad Haddin and Peter Nevill in the XI to play Derbyshire.
First-choice gloveman Haddin didn`t play at Lord`s after withdrawing because of "family reasons", with Nevill impressing on his Test debut.
Both players are set to share wicket-keeping duties in this match ahead of the third Test, which starts on July 29.
Australia`s team at Derby also included Pat Cummins -- the fast bowler appearing in his first-class match in two years following back and foot injuries.