Update: Monday, Oct. 14
According to Danish tabloid newspaper Ekstra Bladet, Wozniacki has denied the couple split.
"I'm so tired of the rumors," she said. "They occur every time Rory and I are apart a few days or do not write on Twitter. There is nothing in it, and from now on I just think that I will keep my private life private."
---End of update---
Here is the photo in question, via Wozniacki's Twitter account:
If the report is true, this may be one of the oddest things that has led to the end of a relationship.
Per Kyle Porter of CBS Sports, McIlroy's management "did not offer any comment, stating that they do not comment on McIlroy's personal life."