Coco Gauff warned she is not even close to achieving her full potential and targeted the Tokyo Olympics after the 15-year-old exited the Australian Open in tears on Sunday.
Gauff's fellow American Sofia Kenin recovered from a set down to win 6-7 (5/7), 6-3, 6-0 and reach the last eight in Melbourne.
The 14th seed plays Ons Jabeur after the unseeded Tunisian defeated China's Wang Qiang to become the first Arab woman to reach a Grand Slam quarter-final.
Gauff, the youngest player in the draw, is one of the stories of the Australian Open, beating Venus Williams in the first round and then reigning champion Naomi Osaka in round three.
Gauff, who turns 16 in March and now has to get back to school homework, blamed her loss on too many errors and said that nerves had nothing to do with it.
But she also admitted that the last few weeks had almost been too good to be true.
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"I couldn't really write this, I don't think anybody could really write how this past couple months have gone," said the teenager.
"I still have so much I feel like I can get better on. Even my parents, my team, they all believe I can get better.
"I don't even think this is close to a peak for me, even though I'm doing well right now."
"It will be difficult, but I'm going to try as hard as possible." - 'I'm proud' -
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