NEW YORK — After serving poorly for one set throughout a US Open victory, Coco Gauff headed to a follow courtroom for some additional work on that stroke Wednesday night time.

She realized her tosses had been too far in entrance of her and too low, so even when she beat 99th-ranked Tatjana Maria 6-4, 6-0 to succeed in the third spherical, Gauff needed to repair the difficulty.

“I did not serve nice in any respect,” Gauff stated after stretching her profitable streak to 9 matches on the web site of her first Grand Slam title a yr in the past. “I obtained fortunate. I feel I solely obtained damaged as soon as, however in all probability may have — ought to have — gotten damaged a few extra instances.”

Gauff, a 20-year-old from Florida, had all kinds of bother on the outset below the lights at a sizzling and muggy Arthur Ashe Stadium towards Maria, a 37-year-old from Germany who made it to the Wimbledon semifinals two years in the past and was hitting slices on practically each forehand and backhand.

“I like Tatjana … [but] she’s very annoying to play,” Gauff stated. “Tonight was simply an annoying match. The balls, you had been capable of hit winners on them, however as a result of she’s slicing it, it’s a must to generate all the ability. Generally it may be extra bodily tiring than it appears to be like, as a result of it’s a must to generate actually 100% of the ability each single time, in comparison with perhaps anyone the place you may simply redirect.”

There have been seven double-faults for Gauff within the preliminary set. She put in fewer than half of her first serves. She confronted 5 break factors, saving 4. Issues arose in different features of her play, too, together with profitable the purpose on simply 9 of 17 journeys to the web, and a complete of twice as many unforced errors, 20, as winners, 10.

Her physique language was ceaselessly unfavourable as will be after a number of the errors. Gauff would have a look at her visitor field and put her palms up as if to say, “What’s going on?” She would roll her eyes or put a hand on a hip, together with after one wild swinging volley that sailed a number of ft lengthy.

When the No. 3-seeded Gauff served for the opening set, she double-faulted twice and confronted a pair of break factors that will have allowed Maria to get the rating to 5-all. However Maria missed a forehand on the primary, and Gauff struck a cross-court forehand passing shot on the second, then completed off the sport.

The second set was a totally completely different story.

Gauff put collectively 15 winners to merely 5 unforced errors — two of which had been double-faults — and went 10 for 11 on the internet.

“She’s a mentally actually robust participant,” stated Maria, whose two daughters, ages 10 and three, sat within the stands. “She has a number of energy. I knew that I had my possibilities as we speak, as a result of I do know that my recreation type isn’t one she prefers. I had my possibilities within the first set that I did not take. This type of participant … in the event you do not take your possibilities, then it goes away. That is what occurred as we speak.”

On Friday, Gauff will tackle Twenty seventh-seeded Elina Svitolina, a three-time main semifinalist who was a 6-1, 6-2 winner towards Anhelina Kalinina, for a berth within the fourth spherical.

Gauff arrived in New York off a sequence of early exits elsewhere. That included two consecutive losses at hard-court tuneup occasions this month, which adopted eliminations within the fourth spherical at Wimbledon and the third spherical of the Paris Olympics, each in July.

“It has been a troublesome few weeks,” Gauff stated.

Gauff’s 9 double faults Wednesday had been three greater than she had in her opening-round match towards Varvara Gracheva. She put solely 43% of her first serves in play Wednesday, means down from the 64% mark in her opening match.

Regardless of the serve troubles, Gauff closed out each her first- and second-round matches with a 6-0 set. She is the primary defending US Open ladies’s champion to win two bagel units in her first two matches since Serena Williams in 2013 (received title).

Gauff additionally improved to 22-3 in majors for the reason that begin of her 2023 US Open title run. That is essentially the most main wins by any lady in that span.

ESPN Stats & Info and The Related Press contributed to this report.