Off the heels of an award-winning rookie season, Cooper Flagg has put his feet up on vacation and has seemingly hard-launched a relationship. New pictures on Instagram showed the Mavericks star and Duke women’s basketball center Arianna Roberson having fun in the sun. While the two did not share pictures of one another on Instagram, they both posted photos of themselves enjoying the same swings over the ocean at Noah’s Ark in Turks and Caicos on Friday. Flagg, 19, sat in one of the swings while Roberson posed holding the swing and her sunglasses for her photo op. Cooper Flagg enjoys his offseason vacation in Turks and Caicos with his new girlfriend. Instagram @cooper_flagg Duke women’s basketball player Arianna Roberson poses for a picture while on vacation with the Mavericks star. Instagram @arianna.roberson The two seemingly met through their Duke connection. Roberson overlapped with Flagg for a year at the school when they were freshmen in the 2024-25 season.…