Basketball League upon their arrival and took part in various exhibition games sponsored by his family's sports apparel company, Big Baller Brand. In his professional debut on January 13, 2018, Ball went scoreless in a 95–86 loss to Lietkabelis. On February 11, he made his first start, recording 13 points in a 97–95 victory over Šiauliai. On March 25, Ball scored a season-high 28 points with six three-pointers in a loss to Nevėžis. On March 27, 2018, he announced that he would enter the 2018 NBA draft, even though most analysts believed that he was a long shot to be selected. On April 19, Ball injured his ankle and left early versus Juventus Utena. On April 25, Ball left Prienai with his family, with their father being critical of head coach Virginijus Šeškus. He finished the LKL season averaging 12.6 points and 2.7 rebounds per game, shooting 41.5% from the three-point line. Ball was not selected at the 2018 NBA draft. Los Angeles Ballers (2018) On July 9, 2018, Ball signed with the Los Angeles Ballers of the Junior Basketball Association, a league founded by his father as an alternative to college basketball. He joined in the middle of the season and made his debut on July 14, tallying 53 points, 10 rebounds, and 10 assists. Ball was named to the West roster for the JBA All-Star Game and was named co-MVP of the game after scoring 39 points. Ball recorded 39 points, 15 rebounds, 7 assists, and 3 steals in a 202–189 win to claim the All-Star Game MVP award. In his first playoff game, he scored a season-high 58 points in a 157–134 win over the Philadelphia Ballers. On August 12, Ball matched his season high of 58 points, 11 rebounds, and 6 assists in a Finals victory over the Seattle Ballers and was subsequently named Finals MVP. At the end of the season, Ball was among 14 players in the league named to the JBA USA select Team, which faced several European teams on an international tour. Greensboro Swarm (2021–present) In July 2019, Ball underwent surgery for an ankle injury and missed the NBA Summer League. On December 29, he signed with the Oklahoma City Blue of the NBA G League as a practice player. On March 9, 2020, he signed with the Blue by waiver claim. The Blue played just one game, which Ball did not