Cooper Flagg and Arianna Roberson had been giving Duke basketball fans just enough to wonder, but never enough to call it official. The rumors first picked up during Flagg’s Rookie of the Year celebration, when Roberson was spotted courtside beside his parents as the Mavericks rookie edged out former Duke teammate Kon Knueppel for the honor. After that, the two kept things quiet while Flagg finished out a demanding first NBA season. But with Roberson’s vacation clips from Turks and Caicos and Flagg’s own version of the big reveal, the former Duke standouts have finally taken the speculation public with a clear “hard launch.”

The Mavericks star posted an Instagram story featuring a photo of the couple sharing a kiss, adding two black heart emojis to put any remaining speculation to rest officially. Roberson later reposted the photo with the same black heart emojis, making the confirmation feel mutual without either of them needing to say much.

Roberson, the sister of former Thunder forward Andre Roberson, shared several TikToks from the couple’s vacation in Turks and Caicos. The clips showed her and Flagg coordinating outfit transitions, holding hands, embracing, and enjoying the luxury getaway together. In one of the videos, she added the caption, “Carry on…” with a kissing-face emoji, leaning into the attention without spelling everything out. The posts came after fans had already noticed both players sharing separate photos from the same swings over the ocean at Noah’s Ark, a beach club and bar in Turks and Caicos. That was the breadcrumb that pushed the rumors into overdrive before the couple finally gave fans something clearer.

However, their actual story is still unclear.

The pair haven’t openly spoken about how their relationship took off, though their Duke connection appears to be the obvious starting point. Roberson and Cooper Flagg both overlapped at Duke during the 2024-25 campaign. Flagg had a historic season, winning Naismith Player of the Year honors while solidifying himself as the best prospect in the country. Roberson also arrived with great promise as a top-20 prospect and five-star recruit. Sadly, she suffered a knee injury that sidelined her for her freshman season.

She didn’t disappoint in her official rookie season with the Blue Devils. The 20-year-old center averaged 8 points and 5.7 rebounds in just 17.8 minutes, shooting 41 percent from the field across 33 games. Roberson has also represented Team USA during the 2024 FIBA 3×3 U18 World Cup, where she helped the team to a gold medal finish.

For both players, the timing of the public reveal makes sense. Flagg was adjusting to life as the No. 1 overall pick, carrying major expectations in Dallas, and closing out a Rookie of the Year campaign. Roberson, meanwhile, was building her own rhythm at Duke after losing her first college season to injury. Instead of turning the relationship into a storyline too early, they let the speculation sit in the background until the season was over and the vacation posts made it impossible to miss.

Cooper Flagg is excited for sophomore growth

Cooper Flagg’s rookie season was nothing short of sensational. He made history, becoming the first teenager to score 50 points in an NBA game. He also became the second-youngest player to win Rookie of the Year, behind only LeBron James. As the season progressed, the Mavericks’ rookie kept getting better. He figured things out, showing his basketball instincts and innate feel for the game. The star mantle walked up to Flagg, and not the other way around.

However, even with the Rookie of the Year trophy to show, the 19-year-old is preparing to take another leap during his sophomore season in the NBA.

“I’m going to work on a lot of different things. There is always room for improvement in every area of the game. I think there is a ton of growth that I can make offensively, off the dribble and making reads at a high level. I’m excited to just get in the gym, especially with some of the guys, and continue to learn and grow in a lot of different areas,” said Flagg.

As a raw prospect, Cooper Flagg is well ahead of most second-year players in the league. He entered as an elite defender, versatile enough to guard multiple positions. And he’s finding his spots on the court, becoming a consistent 20-point scorer. That’s likely going to see an uptick once Flagg works on his three-point shot and polishes his gifts even more in the gym.

For now, he’s getting much-deserved rest. The relaxation on vacation is to unwind from a tough season for the Mavericks. But once the soreness goes away, Flagg will attack training with the focus of turning Dallas into a winning franchise again.