COCO GAUFF broke down in tears during her US Open second-round win — and then thanked gymnastics GOAT Simone Biles for helping her pull through.

The American, 21, endured an emotional rollercoaster on Thursday evening, especially in the first half of her 7-6 6-2 victory over Croatian Donna Vekic on the Arthur Ashe Stadium.

After being broken at 4-4 in the first set following a double fault, she sat in her chair, placed her head in her towel and started bawling.

And when she spoke to an ESPN reporter on-court following the one-hour, 39-minute win, she had to stop talking as she started to cry.

The female journalist had made an embarrassing mistake of calling Gauff “Simone” before the interview had started.

It was a scrappy, far-from-smooth encounter with 18 double faults – 10 for Vek

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