Blue was a key rotation player as a freshman and sophomore, and stepped into a starting role in his junior season.

[11] He made his NBA debut later that day, recording 2 points, 2 rebounds and 1 assist in a 113–111 win over the Washington Wizards.

On March 7, Blue was traded to the Idaho Stampede in a four-team deal,[15] and played out the rest of the 2013–14 season with the team.

The next day, he was traded to the Los Angeles D-Fenders in exchange for a second round pick (36th overall) in the 2014 NBA Development League Draft.

[20][21] On April 13, 2015, Blue signed with the Los Angeles Lakers to help the team deal with numerous injuries.

The Lakers had to use an NBA hardship exemption in order to sign him as he made their roster stand at 16, one over the allowed limited of 15.

[22] Due to the severe lack of guard depth, in the two games he played for the Lakers, he logged 26 and 48 minutes respectively.

He was twice named Player of the Week during the season and helped the D-Fenders finish tied for the best record in the Western Conference at 34–16.

On March 29, he made an NBA D-League-record 23 free throws en route to a season-high 41 points to go with seven rebounds and five steals in a 139–132 road victory over the Reno Bighorns.

[36] Blue went to win the 2018 edition of the Italian Basketball Cup with Fiat Torino by beating Germani Basket Brescia 69–67 in the Finals.

[39] On January 24, 2019, Blue was traded to the Texas Legends for the returning player rights to Damon Lynn and a 2019 NBA G League second round pick.

[44] On February 19, 2021, Blue signed with Club Atlético Peñarol of the Liga Uruguaya de Basketball.