MANCHESTER, ENGLAND - SEPTEMBER 02: Usman Khawaja of Australia prepares to bat during the Australia Nets Session at Emirates Old Trafford on September 02, 2019 in Manchester, England. (Photo by Ryan Pierse/Getty Images)

The Queensland Bulls have picked up their second win of the Marsh One Day Cup season, but it's Alex Carey's big century which would have left the Australian national selectors interested.

Australia are set to play Australia A in a warm-up game ahead of the Ashes starting on Tuesday in Brisbane, however, miserable weather may scupper the chance for Australia to have a proper red ball hit out.

It means runs at domestic cricket level could become even more vital with the Australian selectors still needing to answer two key questions ahead of the first Test.

While it is appearing more and more likely that Marcus Harris will open the batting alongside David Warner, Tim Paine's exit has created a two-way shootout for the wicket-keeping position between Alex Carey and Josh Inglis, who were both named in the Australia A squad, while Usman Khawaja and Travis Head are competing for the number five spot in the batting order.

The selectors would have been thrilled with Carey's touch in Adelaide as he plundered 101 runs off 93 balls from the top of the order, building a classy innings in a mammoth 159-run partnership alongside rookie Henry Hunt.

Carey was already seen as having the inside running on the position, although his domestic form with the bat has been miserable this summer, making just one century in a one-day game back in September, and one half-century in the Sheffield Shield also against Queensland in mid-October.

MELBOURNE, AUSTRALIA - FEBRUARY 13: Alex Carey speaks to the media during a press conference at Quay West Hotel on February 13, 2018 in Melbourne, Australia. (Photo by Kelly Defina/Getty Images)

His scores since that game against Queensland across all formats before today have been 5, 0, 7, 6, 2 and 3, however, Inglis has been in quarantine since arriving back home from the T20 World Cup and would need a big score in Brisbane next week to force the selectors hands.

Less thrilled however the selectors would have been with Head and Khawaja. Both players have been inconsistent to start the summer, and that trend continued on Sunday, with Head making a scratchy 29 off 37 balls before Khawaja failed to spark the case with just 16 off 25.

Marnus Labuschagne also failed for Queensland with 11 off 29, but it didn't stop the Bulls from mowing down the Redbacks total of 274 with almost eight overs to spare as former Australian opener Matt Renshaw sent the selectors a timely reminder with a staggering 156 off 109 balls.

The battle for number five appeared to be going the way of Khawaja until a recent Sheffield Shield match between the two sides, when a second innings century from Head gave thee selectors plenty to think about, it being his second red ball and third overall century of the summer.

Khawaja has scored two centuries this summer in the Sheffield Shield, as well as two half-centuries in 11 innings across all formats.

The Ashes begin on December 8 at the Gabba.