The BIG sign Aussie tennis star Nick Kyrgios may have moved on from influencer girlfriend Costeen Hatzi

Australian tennis star Nick Kyrgios and his longtime partner, influencer Costeen Hatzi, have reportedly parted ways after more than three years together.

The pair have been the glamour couple of Australian sport for almost four year, however behind the scenes, things were reportedly unravelling. 

According to News Corp, the pair had started growing apart, with lifestyle differences at the heart of the split.

‘Nick is a party boy,’ one insider told The Daily Telegraph. ‘He always has been.’ 

Another added, ‘She would have to be willing to accept how he rolls and she won’t anymore.’

Signs of trouble surfaced recently when both removed each other’s initials from their Instagram bios. 

Kyrgios is currently in the United States trying to resurrect his tennis career after a long injury layoff

Hatzi has reported returned home to Australia without Kyrgios amidst rumours the glamour couple have split up

The pair were often seen sharing affectionate moments both on and off the tennis court

Hatzi, 24, also returned to Australia from the US, where she had been staying with Kyrgios, suggesting a definitive break.

Daily Mail Australia has contacted both Kyrgios and Hatzi for comment.

The couple first met in late 2021 through Instagram when Kyrgios contacted Hatzi about a mirror she was selling. 

What started as a simple message quickly evolved into a serious romance, with the pair going public in January 2022.

Hatzi later described their connection as ‘love at first sight.’ By May that year, the couple had moved in together, sharing a Sydney apartment.

Throughout their relationship, Hatzi, a Sydney-based influencer and psychology graduate from Australian Catholic University, became a familiar face on the international tennis circuit. 

She followed Kyrgios across Europe, the UK, and the US, supporting him at various tournaments.

In 2023, their bond appeared stronger than ever. They adopted a dachshund puppy named Boo, with Hatzi posting a photo captioned ‘my family’ on Instagram.

The couple’s dachshund Boo (pictured) quickly became a beloved addition to their little family

Hatzi frequently joined Kyrgios on the ATP tour, offering support throughout his tennis career

Hatzi embraced the world of tennis despite having no background in the sport before meeting Kyrgios

Despite Kyrgios battling injuries and missing the Australian Open two years in a row, Hatzi stood by him through rehabilitation and surgeries. 

In January 2025, she expressed her pride on the Today Show, saying, ‘I’ve waited so long and I’m super proud of him to get to this point.’

Just months ago, they were dubbed one of Australian tennis’ most iconic couples. 

Hatzi had grown from someone unfamiliar with the sport to a committed supporter, frequently seen courtside.

In Netflix’s docuseries Break Point, she admitted, ‘I never really watched a tennis game in my life, so yeah, this is all new for me.’

Despite her lack of tennis knowledge, Hatzi embraced the lifestyle and was often credited with having a positive influence on Kyrgios.

‘I’ve seen him in previous relationships, and they perhaps were taking him in the other direction,’ Kyrgios’ manager Daniel Horsfall told ESPN. 

‘[Costeen] lifts him up and gives him motivation and inspiration, and she’s just a great partner to him.’

Hatzi often praised Kyrgios’ resilience and determination during his injury comeback efforts

The couple travelled the world together for tennis and recreation in a relationship spanning almost four years 

Earlier this year, Hatzi opened up to 9honey about her daily life on tour with Kyrgios, describing a routine that included breakfast, training sessions, and downtime at the player’s lounge. 

‘In my day-to-day life, Nick’s just my boyfriend,’ she said at the time.

She also reflected on the surreal moments of dating a global tennis star.

‘And then I go to his practice and there’s so many cameras… and I’m like, ‘Oh, you’re actually a really good tennis player too.’

While the pair shared many light-hearted moments, including a cheeky viral clip where Hatzi jokingly called a fellow WAG a ‘b**ch’ during a fashion brand interview, there were signs of mounting pressure.

Hatzi previously shared that she handled all the cleaning duties at home. ‘Nick doesn’t have to worry about that,’ she said.

Though fiercely competitive, she acknowledged that no one matched Kyrgios’ level of intensity. 

‘I don’t think that anyone is as competitive as Nick,’ she said in January.

The couple often shared glimpses of their relationship on social media, but have now removed their initials from each other’s bios

As an influencer and businesswoman, Hatzi worked with brands like Bondi Sands and said she wasn’t bothered by the ‘WAG’ label often attached to her. 

‘It doesn’t really bother me — I am there to support Nick — but I do my own thing as well,’ she said.

The split comes as Kyrgios attempts to return to top form after a long injury layoff.

At the Miami Open, he secured his first tour-level win since 2022, defeating Mackenzie McDonald. 

However, his run was cut short by Karen Khachanov, who dominated in straight sets.

Kyrgios’ frustration boiled over during the match, resulting in a warning from the umpire after he smashed a ball high into the stands.