15-year-old Cori Gauff earns more age records, becoming the youngest..

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American teenager Coco Gauff stunned top seed Kiki Bertens to advance to her maiden WTA semi-final with a 7-6 (1) 6-4 victory at the Linz Open in Austria on Friday, then went back to her hotel to do her schoolwork.

But after getting a bit of luck, the 15-year-old has taken full advantage to become the WTA's youngest tennis finalist since Nicole Vaidisova in 2004 after beating Andrea Petkovic 6-4 6-4 Saturday.

Coco Gauff, with a win over Andrea Petkovic in the Linz Open semifinals, has added another milestone to her young career.

'This is insane, I thought I was out of the tournament in qualifying, ' said the American.

She fell in qualifying to Tamara Korpatsch but snuck into the main draw as a "lucky loser" when another player pulled out injured, beat Stefanie Voegele in the first round and advanced to her first ever quarterfinal when Kateryna Kozlova - who won the first set - retired with a left leg injury.

"This was one of many highest-level matches I've performed".

The present world quantity 110 is ready to climb to at the least 80th within the rankings subsequent week.

"This definitely has been an unreal tournament", an excited Gauff told the press, after her win.

"This is insane", Gauff added after winning in 92 minutes.

Gauff, just 15, burst onto the scene at Wimbledon as she reached the fourth round, before impressing again at the US Open, her home grand slam, by winning two matches.

"I'm really happy and proud of myself", said Gauff afterward.

The youngest-ever victor of a WTA Tour title was two-time US Open champion Tracy Austin, aged simply 14, at Portland in 1977.

Gauff saved nine of 10 break points and broke her opponent for 3-2 in the second set as Petkovic saved five break points before double-faulting on a sixth.

Her mother arrived in time to watch her daughter, flying in from Luxembourg after arriving from Florida.

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