Costeen Hatzi and Nick Kyrgios. Photo: Don Arnold/WireImage; Kelly Defina/Getty

Nick Kyrgios and Costeen Hatzi have sparked split speculation.

Breakup rumors swirled around the Australian tennis star, 29, and his influencer girlfriend over the weekend after eagle-eyed fans noticed cryptic messaging on their respective social media accounts across Instagram and TikTok.

The first sign users picked up on was an adjustment to the pair’s respective Instagram bios, reportedly removing each other’s initials from their profiles where they previously were written.

On March 29, the content creator posted a cryptic message on TikTok that had fans speculating it was about her boyfriend amid breakup speculation. She filmed the video with her friend, Golda Mansour.

Nick Kyrgios of Australia hits a backhand against Karen Kachanov of Russia in the second round of the men’s singles in the Miami Open at the Hard Rock Stadium on March 21, 2025 in Miami Gardens, Florida.Frey/TPN/Getty

“Part 37. Who the f–k did I marry? So at this point in time I have filed for divorce,” Hatzi lip synced in the clip. “You don’t see your friends in a while and you have to update her on your chaotic life,” she wrote over the video.

She captioned the post, “Spilling the tea ☕️,” before quipping, “It’s a joke guys lol.”

The comment section was filled with questions, asking if she and the tennis star broke up. She responded to one, which left fans wondering more.

“Do you have a broken heart,” asked one user. To which Hatzi replied, “No ❤️❤️❤️.”

Meanwhile, over on the tennis WAG’s Instagram, she posted a carousel of glammed-up images that featured her wearing a white, strapless dress and applying lipstick in a mirror. “Touch ups,” she captioned the post shared on March 31.

Kyrgios seemingly added to breakup speculation by leaving a simple heart-eye emoji in her comment section.

Neither Hatzi nor Kyrgios has addressed the split rumors publicly, nor did they immediately reply to PEOPLE’s request for comment on the matter.

The couple have been dating since 2021, the same year they met during an interaction Hatzi has previously described as love at first sight. At the time, she wasn’t a huge tennis fan.

In 2022, she and Kyrgios moved into an apartment together in Sydney. Hatzi frequently posts videos of their living space on social media, including their renovations and interior decorations.

Nick Kyrgios and Costeen Hatzi. Costeen Hatzi Instagram

In a January 2023 ESPN profile of Kyrgios, his manager Daniel Horsfall said that her presence on tour has had a positive impact on his game.

“I’ve seen him in previous relationships, and they perhaps were taking him in the other direction,” Duguid told ESPN. “[Hatzi] lifts him up and gives him motivation and inspiration, and she’s just a great partner to him.”

Kyrgios has also praised Hatzi’s support, telling reporters at the Citi Open in Washington, D.C. that “just being at peace” with life helps his game. “You know, I’m fortunate enough to be in a really healthy relationship that’s loving, she’s supports me, and we just have fun,” the tennis pro said of his girlfriend.