Neil Harman of the Times, who is perhaps Britain's most respected tennis journalist, made the claim from Paris where he covered Wozniacki's first round loss to Yanina Wickmayer at the French Open.
"Caroline Wozniacki played tennis in a lovely old arena at Roland Garros but would rather have been in Belfast, asking Rory McIlroy to his face why he left her this way. Except that the last time he called, less than a day after telling her how much he loved her, it was a three-minute conversation she thought was a joke," Harman wrote in the Times.
"On Court No 2, in the press conference room, as she made her way back to the locker rooms and stood, plaintively, colourless, empty and in need of a hug from someone, no one was laughing. She had somehow managed to find the heart to spend two hours and seven minutes competing, but then she wanted to be as far away from this place as possible.
"She still has no rationale for what happened a week earlier when, having flown from their apartment in Monaco to prepare to play the BMW PGA Championship at Wentworth, McIlroy made the call that left Wozniacki weak at the knees, for all the wrong reasons. He had called the whole thing off, six months before the wedding. She then stared blankly at the phone, her life having changed in little more than an instant."
The 23-year-old Dane vowed to move on in her life after Wickmayer won a high-quality baseline battle condemning Wozniacki to her first opening round defeat at Roland Garros since her debut in 2007.
At the post-match press conference, the former world No.1 said she would not answer questions about her private life, but made a short statement.
"The only thing I really have to say is that, you know, thank everybody for their support and sweet messages. That's really nice.
"You know, what happens in my personal life, I just want to really keep that between my closest people around me. You know, I just have to move on."
She later added: "You're not prepared for something like this, and it came as a bit of a shock. You need to just keep going and keep moving forward."
Wozniacki had to play just two days after watching golf star McIlroy win at Wentworth in his first tournament after their split.
"I guess when I got inside the ropes this week it was a little bit of a release," he explained.
"I was on my own and doing what I do best which is playing golf and that sort of gave me four or five hours of serenity or sanctuary or whatever you want to call it."
Last week, McIlroy admitted it had been his decision to split with Wozniacki just days after the pair had sent out the wedding invitations.
"There is no right way to end a relationship that has been so important to two people," McIlroy said in a statement. "The problem is mine."
The double Major champion had been seeing the Danish tennis superstar for three years, and the duo got engaged on New Year's Eve.
They frequently attended each other's events, with McIlroy once leaping out from the stands to take part in one of Wozniacki's exhibition matches, and Wozniacki famously caddying for her boyfriend at Augusta's pre-tournament par-3 tournament in 2013.
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