Rienk Johannes Mast (born 19 July 2001) is a Dutch basketball player for the Indiana Pacers of the National Basketball Association (NBA). He played college basketball for the Bradley Braves and Nebraska Cornhuskers. Standing at , Mast usually plays the power forward or center position. He is a current member of the Dutch national basketball team.
Early career After playing korfball first as a kid, Mast switched to basketball for the club Celeritas-Donar from Groningen. After a couple of years, he changed teams to RTC Noord where he was coached by Marco van den Berg. As a youngster, Mast received offers for Real Madrid Baloncesto to play in their program.
Professional and college career Donar 2017–18: Rookie season Mast played his first professional seasons for Donar, as he was added to the roster for the 2017–18 season. When Mast played his first game, he was 16 years old. On 1 February 2018, Mast scored 24 points in a NBB Cup game against Racing Beverwijk, which made him the youngest top scorer for Donar in history. In the 2017–18 season, Mast started in 3 of the 29 games he played for Donar and averaged 3.6 points and 2.0 rebounds in the Dutch Basketball League. He played two games in the continental fourth-tier FIBA Europe Cup competition.
2018–19: Breakthrough season In the 2018–19 season, Mast had his breakthrough season. Because of personnel changes within Donar and American players leaving, Mast was given a place in the starting five from January. On 12 January, he scored a career-high 30 points in a 101–67 win against BAL Weert.Donar vs BAL In April 2019, he was awarded the DBL MVP Under 23 award, as well as the DBL Most Improved Player award.
Bradley On 21 January 2019, it was announced that Mast committed to Bradley University to play for the Braves. He redshirted his freshman season. As a redshirt freshman, Mast averaged 8.6 points and 5.9 rebounds per game. He was named to the Third-team All-Missouri Valley Conference as a sophomore.
Nebraska In April 2023, after four years at Bradley, Mast announced that he would be transferring to Nebraska, where he would have two years of eligibility remaining. He explained his move by stating that "Bradley is a great basketball spot, [...] but you get to play against high majors 4-5 times a season. I want to see how I match up and play under bright lights every night. I want to see how I stack up against the best competition in college." After playing one year with Nebraska, Mast sat out the entirety of the Nebraska's 2024–25 season due to an injury on his left knee that required surgery; he obtained a medical redshirt and was confirmed to be returning to Nebraska the following season.
Indiana Pacers On June 25, 2026, after going undrafted in the 2026 NBA draft, Mast signed with the Indiana Pacers on an Exhibit 10 contract. He played 4 games for the team in the 2026 NBA Summer League, averaging 15.3 points, 9.0 rebounds, and 1.8 assists per game.
International career Youth teams In 2017, Mast played for the under-16 and the under-18 Netherlands national basketball team. He played at the 2017 FIBA Europe Under-16 Championship Division B, where he reached the final and made the tournament All-Star Team. Mast averaged 11.9 points, 10.1 rebounds and 1.4 assists per game.
In 2018, Mast won the 2018 FIBA Europe Under-18 Championship Division B while being the captain of the Dutch under-18 team. On January 21, he committed to play for the Bradley Braves in NCAA.
Senior team On November 16, 2018, Mast was selected by head coach Toon van Helfteren to be a part of the Netherlands senior team for the first time. On November 29, 2018, Mast made his debut for the Netherlands in a 78–105 loss to Poland.
Honors Club Dutch Basketball League (1): 2017–18 Dutch Cup (1): 2017–18
Individual awards DBL MVP Under 23: 2019 DBL Most Improved Player: 2019 DBL All-Rookie Team: 2018 2017 FIBA Europe Under-16 Championship Division B All-Star Team: 2017
Career statistics
College
| style="text-align:left;"| 2019–20 | style="text-align:left;"| Bradley | style="text-align:center;" colspan="11"| Redshirt |- | style="text-align:left;"| 2020–21 | style="text-align:left;"| Bradley | 28 || 19 || 23.5 || .484 || .359 || .724 || 5.9 || 1.3 || .3 || .5 || 8.6 |- | style="text-align:left;"| 2021–22 | style="text-align:left;"| Bradley | 31 || 31 || 27.5 || .476 || .284 || .695 || 8.4 || 1.4 || .5 || .9 || 11.6 |- | style="text-align:left;"| 2022–23 | style="text-align:left;"| Bradley | 29 || 29 || 28.7 || .518 || .353 || .736 || 8.0 || 2.4 || .6 || .5 || 13.8 |- | style="text-align:left;"| 2023–24 | style="text-align:left;"| Nebraska | 32 || 32 || 29.8 || .433 || .344 || .838 || 7.5 || 3.0 || .4 || .5 || 12.3 |- | style="text-align:left;"| 2025–26 | style="text-align:left;"| Nebraska | 34 || 34 || 29.2 || .442 || .311 || .823 || 5.8 || 3.1 || .4 || .3 || 13.3 |- class="sortbottom" | style="text-align:center;" colspan="2"| Career | 154 || 145 || 27.9 || .467 || .327 || .767 || 7.1 || 2.3 || .5 || .5 || 12.0
References
External links Bradley Braves bio Nebraska Cornhuskers bio