Mahalia Murphy put in a strong performance at the back as the Australian Wallaroos secured a convincing win on Saturday.
The Wallaroos recorded a 34-5 win over Japan in front of nearly 4000 supporters in Newcastle.
Campbelltown Harlequins regular Murphy, 25, was rock solid at fullback for the Australian side.
The Wallaroos scored six tries on Saturday, which was shared between six players - Samantha Treherne, Eva Karpani, Mhicca Carter, Trilleen Pomare, Ariana Hira-Herangi and Averyl Mitchell.
Treherne nailed two conversions for Australia.
Maiko Fujimoto scored Japan's sole try on Saturday.
Wallaroos captain Grace Hamilton told Rugby.com.authat Japan came out firing in the first half.
"That first half was hard," she said.
"We had to absorb a lot of pressure but I think it was laying the platform and when we went to set piece ... if we can go at that and be confident, the rest comes.
"We absorbed that pressure but we also dominated our attack.
"We just had a few loose carries but in that second half we came out firing and I think that showed in the second half."
Mahalia Murphy played her third Test match for Australia on Saturday. She played two games against New Zealand in 2018.
Murphy, who spent the past two seasons at the Campbelltown Harlequins, told the Advertiser in the lead-up to Saturday's game that she was "pumped" to represent Australia again.
"You never know when your last opportunity will come," she said.
Saturday's win means Australia takes a 1-0 lead in the two-Test series against Japan.
The two sides will meet against this Friday night at North Sydney Oval.