Naomi Osaka reacts after losing a point to Anna Blinkova on Tuesday. Photo: Michael Owens/AP
Naomi Osaka reacts after losing a point to Anna Blinkova on Tuesday. Photo: Michael Owens/AP
Naomi Osaka returns a shot against Anna Blinkova. Photo: Michael Owens/AP
Naomi Osaka returns a shot against Anna Blinkova. Photo: Michael Owens/AP
Anna Blinkova managed to win the second set against Naomi Osaka. Photo: Michael Owens/AP
Anna Blinkova managed to win the second set against Naomi Osaka. Photo: Michael Owens/AP

NEW YORK – Naomi Osaka’s US Open title defence is off to a shaky start.

Back in Arthur Ashe Stadium, where she beat Serena Williams in last year’s chaotic final, the No 1-seeded Osaka trailed 3-0 at the outset against 84th-ranked Anna Blinkova, couldn’t close things out in the second set, then eventually came through for a 6-4 6-7 (5) 6-2 victory in the first round.

Osaka wore a black sleeve over her left knee, which has been an issue lately for her.

But it wasn’t so much her movement as her erratic strokes that presented problems for Osaka, who finished with 50 unforced errors, more than double that of Blinkova.

Osaka wasted a match point with a bad forehand while trying to serve it out at 6-5 in the second set, before gathering herself in the third.

Only two US Open women’s champions have lost in the first round the following year during the professional era: It happened in 2017, when Angelique Kerber was beaten by none other than Osaka.

Meanwhile, Sloane Stephens, the 2017 US Open champion, and Madison Keys, the runner-up that year, are among five new members elected to the WTA Players’ Council.

They’re the two new top-20 representatives and join Donna Vekic, Aleksandra Krunic and Gabriela Dabrowski as additions to the council.

Their terms begin on Sunday.

The eight-person board also includes Johanna Konta, Anastasia Pavlyuchenkova and Kristie Ahn.

Venus Williams was not picked to continue on the council after being there “pretty much almost every year of my career,” she said.

Williams added: “I’m a player. I still have input on this tour.”

AP