NEW YORK (AP) — Coco Gauff is out of the U.S. Open on Day 1.

Anastasija Sevastova knocked off the 16-year-old Gauff in three sets, 6-3, 5-7, 6-4 on Monday.

It was Gauff’s earliest exit from a Grand Slam tournament in four appearances. A year ago, Gauff made it to the third round at Flushing Meadows before losing to 2018 champion Naomi Osaka in a match that ended in tears for the teen and a hug from the winner.

Sevastova had been just 1-8 in singles in 2020 and got the breakthrough win she needed again in New York. Sevastova was a semifinalist at the U.S. Open two years ago.

Gauff had 13 double-faults.

No. 9 seed Diego Schwartzman blew a two-set lead and was knocked out of the U.S. Open in the first round.

He led 2-0 but appeared to have problems with cramps as he lost to Cameron Norrie 3-6, 4-6, 6-2, 6-1, 7-5 in a match that took nearly 4 hours.

Top-seeded Karolina Pliskova has advanced in straight sets at the U.S. Open.

Pliskova surged ahead of Anhelina Kalinina 4-1 in the opening set, lost three games in a row, then took the last eight for a 6-4, 6-0 victory. She had a 26-7 edge in winners.

Pliskova is ranked third in the world but has the top seed in New York.

Three-time Grand Slam champion Angelique Kerber is sticking around longer at Flushing Meadows than she did a year ago.

Kerber eliminated Ajla Tomljanovic 6-4, 6-4 in a nearly empty Louis Armstrong Stadium.

Kerber won the 2016 U.S. Open but lost in the first round a year ago. She used to be ranked No. 1 and is seeded 17th in New York.

Marketa Vondrousova is the first winner of a match at the 2020 U.S. Open — and of any Grand Slam match since early February.

The 2019 French Open runner-up, who is seeded 12th in New York, beat Greet Minnen 6-1, 6-4.

The French Open was postponed from May to late September, and Wimbledon was canceled for the first time since World War II.