“You never really know if you’re up to it until you spend some time in the middle and get a little bit of confidence,” he said on Wednesday.

“So hopefully I can continue to grow.”

There were doubts about whether McSweeney was the right choice to open following his 10 and scoreless second innings on debut in Perth, but his performance in Adelaide may have silenced his critics.

Under lights, as darkness crept in, the 25-year-old showed promise with a hard-fought 39 in the first innings.

Digging in alongside close mate and mentor Marnus Labuschagne, the pair put together a 67-run partnership for the second wicket.

“For us to kind of set up the game and get through a tricky period was massive for us, and we just spoke about trying to be ourselves out there [and] running hard between the wickets,” McSweeney said.

Similarly feeling the pressure, Labuschagne put together a steadying 64 runs in the first innings.

“No doubt he (Labuschagne) had some things to work on for himself,” McSweeney said.

“It gives me confidence just realising that we’re all going through the same stuff.”

McSweeney’s efforts in Adelaide earned him high praise from the man her replaced as opener — with David Warner impressed with the South Australian skipper’s intent.

“There are a lot of question marks around why they chose him, but the glimpses that you’ve seen, we now know why,” Warner told media on Wednesday.

“He’s had four of probably the five hardest jobs when it comes to an opening batsman, and I think he’s handled it well.”

Australia’s first training session in Brisbane was sent indoors because of the weather on Wednesday.

With the Border-Gavaskar Trophy tied at 1-all, the third Test against India gets underway at 11.20am AEDT on Saturday at The Gabba.