Uncharted territory: Records smashed by young allrounder

Annabel Sutherland has entered rare air, hitting the fastest double century in the history of women's Tests after she brought up 200 on the stroke of tea on day two at the WACA Ground.

Sutherland resumed on 113 after the lunch break and continued to punish the weary South African bowling attack, bringing up her 150 shortly after drinks.

There was no stopping the 22-year-old Victorian who continued to escalate.

On 190no with an over left before tea, Sutherland drove Nadine de Klerk down the ground for four, faced three dots, before striking another four on the leg side.

Her shot to bring up 200, on the final ball before the break, was the pick of the bunch, a sublime lofted drive down the ground that bounced just inside the boundary rope. 

She reached the milestone in just 248 balls, making it the fastest double ton in women's Test history - blitzing the previous record of 306 balls held by Karen Rolton. 

In the process, she also became the youngest Australian woman to score a double hundred. 

Sutherland was finally dismissed after tea for 210, the second highest Test score by an Australian woman behind teammate Ellyse Perry's 213no.

Sutherland, who started the day on 54 not out, continued to rewrite the record books as she turned her second Test ton, and her first on home soil, into a double.

While she lost Ashleigh Gardner on 65 after lunch, breaking a 144-run stand, but she found another partner in Sophie Molineux, who hit 33 in her Test return and shared in an 86-run seventh-wicket partnership.  

Sutherland is the ninth woman to score a double hundred in a Test and the fifth Australian. 

Former India captain Mithali Raj was the only younger player to score 200, scoring 214 at 19 years old.  

Sutherland had earlier become the first woman to score two centuries batting at No.6 or lower.

Her first Test ton came against England during last year’s Ashes at Trent Bridge, where she struck a superb unbeaten 137 batting at No.8.

That performance saw the 22-year-old elevated to No.6 for Australia’s last two Tests.

Sutherland is the third youngest woman to hit two or more centuries overall, behind India’s Sandhya Agarwal and New Zealand’s Emily Drumm, who both achieved the feat aged 21.

"I love batting ... it's pretty hard to get up the order at the moment in the white-ball stuff, so it’s nice to just get a chance to have a hit out there and it's a very nice place to bat when you're in and set," Sutherland told Channel Seven as she walked off unbeaten on 113 at lunch.

"The first 20 to 30 balls (yesterday) were probably the most challenging, so (I was) trying to be really precise with what balls I was trying to score off.

"I felt like I left the ball alone well outside off stump to get me going.

"We spoke a little (this morning) that it's like you're starting your innings again ... I thought they bowled quite well, Klaas has been challenging all day and Nadine de Klerk as well was just nibbling around."

Sutherland's innings continued what is already a remarkable match for Sutherland, who picked up three wickets as South Africa were bowled out for 76 on Thursday.

Women's CommBank T20I Series v South Africa

First T20: Australia won by eight wickets

Second T20: South Africa won by six wickets

Third T20: Australia win by five wickets

Women's CommBank ODI Series v South Africa

First ODI: Australia won by eight wickets

February 7: South Africa won by 84 runs

February 10: Australia won by 110 runs (DLS method)

Women's CommBank Test Match v South Africa

February 15-18: Only Test, WACA Ground, Perth 11.00am

Australia Test squad: Alyssa Healy (c), Darcie Brown, Ashleigh Gardner, Kim Garth, Jess Jonassen, Alana King, Phoebe Litchfield, Tahlia McGrath, Sophie Molineux, Beth Mooney, Ellyse Perry, Megan Schutt, Annabel Sutherland, Georgia Wareham

South Africa Test squad: Laura Wolvaardt, Anneke Bosch, Tazmin Brits, Nadine de Klerk, Mieke de Ridder, Ayanda Hlubi, Sinalo Jafta, Marizanne Kapp, Masabata Klaas, Suné Luus, Eliz-Mari Marx, Nonkululeko Mlaba, Chloé Tryon, Delmi Tucker