By Janina Nuno Rios

NEW YORK (Reuters) -Former U.S. Open champion Coco Gauff wiped away a flood of mid-match tears after a litany of service errors to defeat unseeded Croatian Donna Vekic 7-6(5) 6-2 and labour into the third round of the Grand Slam on Thursday.

Still in the early stages of her coaching partnership with biomechanist Gavin MacMillan and adjusting to a retooled serve, Gauff had to battle hard in a difficult outing to set up a meeting with 28th-seeded Pole Magdalena Frech.

In a dramatic evening session encounter where both players struggled for rhythm in the first set under the primetime glare of Arthur Ashe Stadium, Gauff reined in her unforced errors on serve just enough to clinch it via a tiebreak.

The 2023 champion had wept into her towel during a break in play a short

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