Naomi Osaka’s quest for a first title in four years ended in heartbreak as the former world No.1 retired with an injury after winning the opening set of the Auckland Classic final against Denmark’s Clara Tauson on Sunday.

It was an anticlimactic finish to the match and Tauson said winning her third WTA Tour title after a similar drought did not gloss over the worst final that she had played.

“I have to say I’m really sorry about this final. Naomi was playing some great tennis. I just feel said about what happened today,” Tauson said.

“Of course, when I process this, I’m going to be super happy about my week. I’m happy that I won, but not really.”

Osaka, who won the last of her four grand slam trophies at the Australian Open in 2021, returned to the circuit a year ago after a long maternity break, but struggled for consistency and ended the season ranked outside the top 50.

She showed glimpses of just how devastating she can be in Auckland and grabbed a double break against Tauson with powerful hitting on both flanks in the opening set, which she wrapped up 6-4, despite dropping serve late on.

But the 27-year-old from Japan had tears in her eyes as she had an apparent abdominal issue checked out on court before the start of the next set and threw in the towel, sparking concerns about her fitness for this month’s Australian Open.

She cut a more cheerful figure at the presentation ceremony, joking that skipping breakfast might have led to her defeat.