The Australian Under-20s weathered some high tackling to defeat Fiji 50-25 in their second pool match at rugby's junior world championship in Padova, Italy.

Coach David Nucifora's squad showed their depth on Tuesday, piling on eight tries to three, despite 10 changes being made to the side which defeated Tonga 54-7 four days earlier.

Australia held a converted try advantage when scores were 14-7 midway in the opening half, before poor discipline saw Fiji have a player sent to the bin in the 13th and then 30th minute.

The Junior Wallabies took control of the match with an extra man on the field, piling on three tries and racing away to a 33-10 lead by halftime.

Fiji fought back in a more even encounter in the second half, scoring 15 points to Australia's 17.

Coach Nucifora said he was happy to share the workload among his squad and said he would field a different XV again for Australia's final pool match against France on Saturday.

"There were high shots everywhere to start with. It was like they came with the intention to really rough us up," Nucifora said.

"I thought we played reasonably well in the first half. There was a fair bit of ball movement and we managed to hang on to the ball for good periods.

"The forwards scored a couple of tries from driving mauls, I thought Michael Hooper and Blake Enever were particularly good."

Australia is aiming to end New Zealand's three-year unbeaten run at the world's premier age-grade rugby tournament.

Brought to you by AAP © 2024 AAP