The couple have been relatively open about their relationship, appearing frequently at each other's events and posting photographs on social media of them together.
Wozniacki acted as McIlroy's caddie for a round before the US Masters in April, while he played a point on her behalf against Maria Sharapova during an exhibition match in New York in 2012. There were rumours late last year that he had ended the relationship, which he quickly quashed.
