DANIELLE Collins has sought revenge on world number one Ash Barty, overturning the result between the pair at last year’s Adelaide International to win in straight sets and book her place in the last eight. The American went down in three sets in last year’s semi-final showdown which saw Barty go on to win the title, but in the Round of 16, it was Collins who got the better of the Australian, stunning her 6-3 6-4 and condemning Barty to her second consecutive loss.
“I think I was really familiar with her game after losing to her three times,” Collins said post-match. “So I certainly got some great tennis lessons out of that and have learned from it.”
The American was the third from her nation to make her way into the quarter finals following Shelby Rogers‘ victory the day before, and young gun Coco Gauff‘s come-from-behind win over sixth seed Croatian Petra Martic. Gauff had to fight back from a set down to win 5-7 6-3 6-4 in two hours and 12 minutes, saving seven of her 10 break points, whilst breaking her opponent four times in a nail-biting encounter. She now takes on Rogers in an all-American affair.
For Collins, having disposed of one Grand Slam winner in Barty, she now has another to overcome. The unseeded American faces Iga Swiatek in the quarter finals after the Pole Roland Garros winner defeated Australian Maddison Inglis in straight sets, 6-1 6-3. On a day that was a disaster for seeds, Swiatek held firm and won through to the final eight, joining second seed Belinda Bencic as the only other seed through to the quarter finals.
The biggest upset of the day – even more so than Collins over Barty – was Storm Sanders‘ triumph over Yulia Putintseva. The 26-year-old world number 292nd had no fears against the seventh seed and world number 28, winning 6-4 5-7 6-1 in a tight affair. In a remarkable second match since they last played nine years ago when they were teenagers, the now 26-year-olds engaged in a two-hour and 18-minute battle which saw Sanders emerge victorious. She saved eight of 10 break points, whilst capitalising on four of nine herself to make her way into the quarter finals to take on Bencic.
In the other results, Latvian Anastasia Sevastova will lock horns with Swiss rising talent Jil Teichmann after both won their respective matches. Sevastova knocked out Christina McHale in straight sets, 6-4 6-3, while Teichmann came from behind to defeat eighth seed Chinese talent, Wang Qiang, 3-6 6-3 6-3.
ROUND OF 16 RESULTS:
Danielle Collins (USA) defeated  Ash Barty (AUS) 6-3 6-4
 Belinda Bencic (SUI) defeated Misaki Doi (JPN) 6-1 6-3
 Iga Swiatek (POL) defeated Maddison Inglis (AUS) 6-1 6-3
Coco Gauff (USA) defeated  Petra Martic (CRO) 5-7 6-3 6-4
Storm Sanders (AUS) defeated  Yulia Putintseva (KAZ) 6-4 5-7 6-1
Jil Teichmann (SUI) defeated  Wang Qiang (CHN) 3-6 6-3 6-3
Anastasia Sevastova (LAT) defeated Christina McHale 6-4 6-3
Picture credit: Tennis Australia/James Elsby