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Dallas Mavericks star Cooper Flagg’s season ended last month, but that hasn’t stopped him from making big plays.
Flagg confirmed his relationship with Duke women’s basketball center Arianna Roberson on Thursday with a post on his Instagram Story. Flagg posted a photo of them kissing while in Turks and Caicos, and Roberson reposted it on her Instagram Story with two black heart emojis.
Roberson also posted a TikTok of the couple together while on vacation, captioning it: “Moving on.”
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(Left) Dallas Mavericks forward Cooper Flagg (32) watches from the team bench during the second quarter against the Orlando Magic at the American Airlines Center in Dallas, Texas, on April 3, 2026. (Right) Duke Blue Devils center Arianna Roberson participates in drills during practice before the Sacramento Regional 2 of the 2026 NCAA women’s tournament at the Golden 1 Center in Sacramento, California, on March 26, 2026. (Jerome Miron/Imagn Images; Ed Szczepanski/Imagn Images)
Rumors about their relationship first started when they posted photos of themselves on their own accounts at the same resort at the same time, leading fans to believe they were on vacation together. They were also seen together at Cameron Indoor Stadium in February, attending Duke’s 101-64 victory over Syracuse.
The couple met for a year at Duke in 2024-25, when they were both freshmen. Flagg declared for the NBA Draft after leading Duke to the Final Four and was ultimately selected with the number one overall pick in the NBA Draft.
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Duke Blue Devils center Arianna Roberson participates in drills during practice before the Sacramento Regional 2 of the 2026 NCAA women’s tournament at the Golden 1 Center in Sacramento, California, on March 26, 2026. (Ed Szczepanski/Image Images)
While the Mavericks struggled and missed the playoffs in Flagg’s rookie year, he had a lot of personal success. He edged out his former Duke teammate Kon Knueppel, a forward for the Charlotte Hornets, to win the NBA Rookie of the Year award.
In 70 games, Flagg averaged 21 points, 6.7 rebounds, 4.5 assists and 1.2 steals per game.
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Dallas Mavericks forward Cooper Flagg dribbles during the second half of an NBA game against the Los Angeles Lakers in Dallas on April 5, 2026. (LM Otero/AP)
Roberson, in 33 games, averaged 8 points per game on 41.6% shooting for Duke. His older brother, Andre Roberson, played seven seasons in the NBA and spent most of his career with the Oklahoma City Thunder.
