In just her second game as captain of the Australian women's rugby team and her 13th appearance in the green and gold, Hamilton was at her inspirational best as she guided the Wallaroos to a 46-3 victory over Japan at North Sydney Oval.

The girl who once was just a rugby union spectator when growing up in Panuara, around an hour from Bathurst, is now a powerful women who returned a player of the match performance.

She crossed for three tries - breaching the Cherry Blossoms' defence in the eighth, 66^th and 70^th minutes - and ran for 204 metres in her 30 carries.

That came on the back of a player of the match performance last Saturday in Newcastle when Hamilton inspired a 34-5 win over Japan with her 168 metres and 12 tackles.

Typically humble - instead preferring to praise her Wallaroos team-mates - Hamilton had no idea of just how impressive her match statistics were on Friday.

"I didn't even know that, but thank you for telling me," Hamilton said.

"No, it's a complete team effort as I have said before. I am just getting the ball off one of the other girls who has done the hard work.

"I was lucky, I was just in the right place at the right time. You know what? We set the platform, we had a little bit of handling errors, but in the end we had momentum and that's what we wanted to keep, momentum through the whole game.

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"That was so special, I walked around [the ground after full-time] and knew everyone every two metres. My family, everyone ... there's about 50 of them that came out from the Central West and I'm so happy they were here."

While Hamilton played down her performance which helped Australia to a two-Test clean sweep of Japan, Wallaroos coach Dwayne Nestor heaped praise on the Central West product.

He also predicted even better things to come from the talented number 8.

"What is there to say? Over 200 carry metres tonight, it's her thing to carry the ball and carry it hard, so we like to play to our strengths," Nestor said.

"Grace loves to be challenged and we spoke about the captaincy and I wondered how it would affect her and I think it spurred her on.

"I think we are only seeing what Grace can do and there is probably more in her as well. I think we can continue to develop her game where she becomes world class, one of the best players in the world."

With 3391 spectators watching on, Hamilton split open the Cherry Blossoms' defence early thanks to her trademark hard running. The Wallaroos went on to lead 27-3 at the break.

While a yellow card in the 53^rd minute to Wallaroos winger Lori Cramer saw the hosts under pressure, they did not concede while she was off the field. They went on to seal their historic first series win on Australian soil.

The performances against Japan - with a number of new Wallaroos' being blooded - is a good sign as Hamilton and her team-mates now look to next month's Tests against New Zealand.

"We have some time off now and we go back to our normal jobs but that's completely fine, we're still training, we're still working hard and we've created a really good culture now. I can't wait to see what we can [do against the Black Ferns]," Hamilton said.