He showed marked improvement as a sophomore and scored a career-high 23 points in a victory over Minnesota on November 29, 2017.

Following the season, he declared for the 2018 NBA draft but did not hire an agent and ultimately withdrew and returned to Miami.

[5] Hernandez ultimately would not play for Miami in his junior season due to eligibility concerns relating to the 2017–18 NCAA Division I men's basketball corruption scandal revolving around Christian Dawkins.

[11] In his first NBA G league game, Hernandez recorded 24 points, 10 rebounds, 3 assists and 2 blocks in a 94–109 loss to the Grand Rapids Drive.

[12] On August 12, 2020, Hernandez scored an NBA-career high 6 points and 2 assists, including clutch shots to help the Raptors win their sixth game in the NBA Restart Season against the Philadelphia 76ers 125–121.

[16] On February 26, 2021, Hernandez was traded to the Rio Grande Valley Vipers in exchange for guard Jarron Cumberland.