Buchanan had his best performance in the NJCAA Region 23 title game with a career-high 34 points on 11-of-17 shooting. He was a NJCAA All-American and signed with Murray State. As a junior at Murray State, Buchanan averaged 9.1 points, 3.9 rebounds, and 1.6 steals per game. He teamed with Ja Morant to lead the Racers to a 26–6 record and appearance in the 2018 NCAA Tournament. As a senior, Buchanan was named to the First Team All-Ohio Valley Conference as well as conference Defensive Player of the Year. He started all of his 33 games and averaged 13.0 points, 4.2 rebounds, 1.7 assists and 1.82 steals per game, helping lead the Racers to the 2019 NCAA Tournament. After the season, Buchanan competed in the Dos Equis 3X3 National Championship. As a 12 seed, Murray State defeated Marquette 83-64 behind 14 points and six rebounds from Buchanan. He finished his career at Murray State with 722 points scored, 110 career steals and 63 starts in his 65 career games. In two seasons at Murray State, Buchanan shot 48.4% from the field, 32.4% from behind the arc and 70.1% from the free throw line. After going undrafted in the 2019 NBA draft, Buchanan played for the Memphis Grizzlies in the NBA Summer League. On October 17, Buchanan signed a one-year contract worth $898,310 with the Grizzlies. He was assigned to the Memphis Hustle of the NBA G-League. On December 5, he had 10 points and five rebounds in a 116–110 win over the Northern Arizona Suns. On February 8, 2020, Buchanan scored a career-high 36 points to go with five assists, four rebounds and two steals in Memphis' 127-119 win over the South Bay Lakers. On February 29, Buchanan posted a career-high 18 rebounds to go along with 22 points and 6 assists in a 123-120 loss to the Salt Lake City Stars. He averaged 11.1 points, 4.8 rebounds and 1.5 assists per game. Jan Wilhelm Hiż  Jan Wilhelm Hiż (18th century) was a Polish military officer, colonel of the Crown Guard ("Gwardia koronna"). He was the son of Wilhelm Hiż, the secretary in the office managing royal goods ("kamera") of kings Jan III Sobieski, August II and August III; and Franciszka de Loupi; grandson of Jan Hiż, a treasurer in the service of Maria Kazimiera Sobieska.