On 16 June 2017, Maledon joined the junior team of LNB Pro A club ASVEL that played in the, the French U21 league. In his season debut on 24 September 2017, he recorded 10 points and five assists in a 71–61 win over Espoirs Limoges. Maledon made his Pro A debut for the senior team on 30 September at age 16, playing one minute versus Cholet. He became the second youngest debutant in club history. On 17 October, he made his first appearance in the EuroCup against ratiopharm Ulm. In January 2018, Maledon played for ASVEL's under-18 team at the ANGT in L'Hospitalet. He recorded 35 points and 11 assists on 7 January to help defeat the junior team of Gran Canaria in his final game in the tournament. On 12 May 2018, Maledon scored 26 points against Espoirs Monaco, his season-high in the LNB Espoirs. Through 33 Espoirs games, he averaged 15.7 points, 4.5 rebounds, and 4.9 assists per game.
2018–19 season
On 13 August 2018, Maledon signed his first professional contract, agreeing to remain with ASVEL for three years. In the 2018–19 season, he assumed a greater role for the senior team and frequently made its starting lineup. On 6 October, Maledon recorded 15 points, four rebounds, and four assists, making six of seven field goal attempts, in an 88–64 victory over Fos Provence. His of 22 in the game was the most by a Pro A player under age 18 since Tony Parker recorded a ranking of 24 against BCM Gravelines in 1999. On 3 November, Maledon recorded a career-high 16 points, four rebounds, and two steals against JDA Dijon. He eclipsed his career-high on 18 November versus Le Mans Sarthe, when he recorded 20 points, four assists, and two steals. On 18 December 2018, against Zenit Saint Petersburg, Maledon had 13 points, along with seven rebounds and three assists, for his best scoring effort in the EuroCup. He recorded 18 points, five assists, two steals, and a career-best ranking of 26, against Levallois on 26 December. Maledon played in the LNB All-Star Game on 29 December, and at age 17 and a half, became the youngest All-Star since the event was created in 1987. On 12 May 2019, he scored a team-high 13 points in a 70–61 win over Le Mans in the French Cup championship and was named Final MVP. Maledon was named LNB Pro A Best Young Player at the end of the season. In June 2019, he helped ASVEL win the Pro A finals over Monaco. In a total of 62 games in the season, Maledon averaged seven points, 2.1 rebounds, and two assists in 17.3 minutes per game.
Entering the 2019–20 season, Maledon was considered the favorite to win the EuroLeague Rising Star award by the league's website. In his season opener, a Pro A win over Limoges on 22 September 2019, he recorded six points and eight assists in 19 minutes. On 4 October, Maledon made his EuroLeague debut, playing nine minutes in a victory over Olympiacos. In his subsequent game, two days later against Cholet, he suffered a shoulder injury that forced him to miss over one month of action. On 17 January 2020, Maledon recorded a career-high 10 assists, along with five points and six rebounds, in a 101–74 loss to Anadolu Efes. One week later, he scored 19 points, his best mark in the EuroLeague, in a 100–88 defeat to Panathinaikos. On 14 February, Maledon matched his career high in scoring with 20 points in an 88–59 victory over Metropolitans 92 at the LNB Pro A Leaders Cup semifinals. On 5 April, while the basketball season was suspended due to the COVID-19 pandemic, he declared for the 2020 NBA draft.
National team career
French junior national team
Maledon made his youth debut for France at the 2016 FIBA Under-16 European Championship in Radom, Poland. Through seven games, he averaged 8.4 points, four rebounds, and 2.4 assists per game. Maledon played for the French team at the 2017 FIBA Under-16 European Championship in Podgorica, Montenegro. He averaged 14.6 points, 5.1 rebounds, and 3.1 assists per game through seven contests, scoring 20 points in the final against Montenegro to help France win the gold medal. Maledon was named captain for France at the 2018 FIBA Under-17 Basketball World Cup in Argentina. Through seven games, he averaged 11.1 points, 6.1 rebounds, and 4.1 assists per game as France finished in second place.
On 24 February 2019, Maledon debuted for the French senior national team during the 2019 FIBA World Cup qualification stage. He played 15 minutes, recording three points and three rebounds, in a 76–69 loss to Finland. On 7 August, Maledon scored 14 points, making four of five field goal attempts, in a 94–56 victory over Tunisia in preparation for the World Cup. He was among the final cuts from France's World Cup roster, in part due to a shoulder injury.
Career statistics
EuroCup
Personal life
Both of Maledon's parents played basketball: his mother, Sylvie, with the French junior national team, and his father, Claude, in the NM1. His uncle, Dominique Guéret, was an assistant coach for LNB Pro B club ALM Évreux, and his older sister, Lena, plays college basketball in the United States.