NEW YORK — The question was rather simple after Angelique Kerber became only the second defending U.S. Open champion in the professional era to lose in the first round.
The surprisingly lopsided 6-3, 6-1 loss to 45th-ranked Naomi Osaka of Japan under the closed roof in Arthur Ashe Stadium at a rainy Flushing Meadows on Tuesday was former No. 1 Kerber’s latest in a long list of disappointing performances in 2017, so she was asked what she thinks went wrong this season.
She sighed, shrugged her shoulders and began to answer: "I don’t know."
Moments later, her eyes darting around the room, she added, "This year is a completely different year."
Talk about an understatement. In 2016, Kerber broke through to the top of tennis in a spectacular way. A player with only one previous Grand Slam semifinal appearance reached the first three major title matches of her career, winning two of them: She stunned Serena Williams in the Australian Open final, lost to Williams in the Wimbledon final, and then beat Karolina Pliskova in the U.S. Open final to rise to the top of the WTA rankings for the first time.
Her follow-up has been quite a flop. Kerber, a 29-year-old German, hasn’t won any title of any sort this season. She is only 25-18 overall, 0-9 against opponents ranked in the top 20, and Tuesday’s loss assured her of falling out of the top 10 for the first time since October 2015. At Grand Slam tournaments she is 6-4, including another first-round loss in May at the French Open, where she became that tournament’s first No. 1 seed to lose so early.
"I know that I’m strong and I know that I will come back stronger, for sure. I know that I will not (be) giving up," said Kerber, the first defending champion to lose in the U.S. Open’s first round since Svetlana Kuznetsova in 2005.
Showers showed up before noon Tuesday and led to the postponements of dozens of matches. The only court used in the afternoon and evening was Ashe, thanks to the retractable cover constructed ahead of last year’s tournament.
Pliskova, who is seeded No. 1, easily advanced by beating Magda Linette 6-2, 6-1, French Open champion Jelena Ostapenko got past Lara Arruabarrena 6-2, 1-6, 6-1 in a match that started on Court 17 then was moved indoors at Ashe, and No. 23 Barbora Strycova defeated Misaki Doi 6-1, 6-3. Yet another seeded woman was eliminated when No. 28 Lesia Tsurenko lost to Yanina Wickmayer 6-3, 6-1.
At night in Ashe, No. 15 Madison Keys of the U.S. compiled a 32-9 edge in winners and moved into the second round by beating Elise Mertens of Belgium 6-3, 7-6 (6). Keys got broken while serving for the match at 6-5, and then faced a set point at 6-5 in the tiebreaker. But Keys delivered a big forehand to force a backhand error by Mertens, starting a three-point run for the American to close out the victory.
The only men’s matches completed were at Ashe, where No. 1 Rafael Nadal overcame a first-set hiccup before overpowering Dusan Lajovic of Serbia 7-6 (6), 6-2, 6-2. Nadal’s possible semifinal foe and chief rival for the title, Roger Federer, was to face 19-year-old American Frances Tiafoe at night.
Kerber’s exit further thins the women’s bracket, which was missing 23-time major champion Serena Williams to begin with because she is expecting a baby. Three of the top seven seeded women were gone before dinnertime on Day 2, with No. 6 Kerber joining Monday’s losers, No. 2 Simona Halep — beaten by Maria Sharapova in her first Grand Slam match since a 15-month doping suspension — and No. 7 Johanna Konta.
While Kerber’s quick departure was stunning in and of itself, that Osaka would be the one to do it might not be quite so remarkable, even if she is just 19 and never won before against a top-10 woman.
Osaka is comfortable around the grounds at Flushing Meadows, where she has been spending time, and even occasionally practicing, since she was a kid: She was born in Osaka, Japan, so represents that country, but moved to the U.S. when she was 3, has dual citizenship, and used to live on Long Island.
"The site," Osaka said, "feels really familiar to me."
She nearly upended Keys in the U.S. Open’s third round last year, leading 5-1 in the third set before losing in a tiebreaker, a collapse on her mind in the latter stages Tuesday.
This time, Osaka held steady, using her powerful baseline game to bully Kerber.
Osaka accumulated a 22-9 edge in winners, broke in half of Kerber’s eight service games and saved all four break points she faced.
"It was not my day," Kerber summed up. "Completely not my day."
Hasn’t been her year, either.
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