Cooper Flagg is entering the next chapter of his career. In a video posted to Instagram on Monday, April 21, the 18-year-old basketball star announced he'll be entering the 2025 NBA Draft. "New fans, my teammates, the brotherhood and everybody that was along for this journey, it was an incredible year," Flagg said after highlight clips from his freshman season at Duke were shown. "I have so much gratitude," Flagg continued. "I feel so blessed for all the opportunities I was given." Despite a disappointing elimination in March Madness for the Blue Devils, Flagg said, "Duke has always been a dream for me, but I'm excited to announce I'll be entering my name into the 2025 NBA Draft." "Today is just the beginning, but I have the brotherhood with me for life," Flagg said to conclude his announcement. Comments of support for Flagg's decision to leave Duke and pursue going professional flooded the replies after his announcement on Monday. Blue Devils player Ryan Young joked, "Congrats Coop, hope someone will take a chance on you in the mid to late second round," poking fun at how Flagg is largely expected to be a top three pick in the draft in June. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Dallas Cowboys star Micah Parsons commented too, calling Flagg a "Duke legend," and fitness coach Jess Sims wrote, "One of one. Congrats coop! Can’t wait for the next chapter 🔥." A former teammate of Flagg's said, "imma miss playing with you!! Go be great #2." Flagg played just one season for the Duke Blue Devils, but quickly became a star. The Maine native is also a twin to brother Ace Flagg, who committed to the University of Maine, where their mother Kelly played college basketball. In March, Kelly told PEOPLE she's very superstitious. "I have to sit in the same seat," she said. "Usually, I like to sit by the same person or in the same seating order. My husband is also superstitious. He can't wear spirit gear on game days, but he can wear it any other day," she continued. "On game days, he wears anything but Duke gear."