In his third NBA season, Iwundu appeared in 52 games for the Magic, averaging 5.8 points, 2.5 rebounds, 1.2 assists and 0.5 steals in a career-high 18.3 minutes. Iwundu made his first start of the season on Dec. 30 against the Hawks, playing 25 minutes and registering four points. He scored in double-figures eight times, including posting a season-high 19 points in a win over the Lakers on Jan. 15. Against the Nets on Aug. 11, Iwundu had 18 points, five rebounds and three assists in 30 minutes. Two nights later, in a seeding-game win over the Pelicans, Iwundu posted 15 points, a season-high six assists and four rebounds. Against Washington on Jan. 8, the Kansas State product grabbed a season-high seven rebounds, adding seven points, two assists and one steal. In the postseason, Iwundu appeared in all five first-round games against the Bucks, averaging 4.2 points, 2.2 rebounds and 0.8 assists in 15.0 minutes per contest. In Game 3, he saw a playoff-career-high 24 minutes and finished with six points, three assists, two rebounds, a steal and a block.

Iwundu's second season in the NBA season saw him set new career-highs in both games played (68) and games started (13). Iwundu averaged 5.0 points, 2.7 rebounds and 1.1 assists in 18.1 minutes per game. The 24 year-old scored a career-high 16 points on 7-of-7 shooting against Toronto on April 1. He scored 14 points and grabbed seven rebounds on March 17 in a 101-91 win over Atlanta. Iwundu grabbed a career-high eight rebounds, while also scoring seven points, on Nov. 11 against New York. He improved his three-point shooting to 36.7 percent for the season, making 29 of his 79 attempts from behind the arc. Iwundu also hit better than 81 percent of his free throw attempts after shooting 72.3 percent from the line as a rookie. In the postseason, Iwundu saw action in all five of Orlando's first-round games against Toronto. In Game 5, Iwundu notched a playoff career-high 12 points on 3-of-5 shooting, while hitting all five of his free throw attempts.

A second-round pick in the 2017 NBA Draft, Iwundu worked his way into Orlando's rotation as a rookie wing player. The Kansas State product appeared in 62 games, picking up 12 starts. In 16.5 minutes per contest, the 23-year-old averaged 3.7 points and 2.2 rebounds. Iwundu shot 42.7 percent from the field and 72.3 percent from the free-throw line. Defensively, he recorded 1.2 steals per 36 minutes. Iwundu made his first start of the season on Dec. 13, and he saw his playing time increase as the season went along. After averaging just 6.2 minutes per game in October and 4.1 minutes per game in November, he saw that number spike to 15 minutes per night in December. Iwundu averaged better than 15 minutes per game the rest of the way. He scored a season-high 12 points in 25 minutes of action against Washington on Dec. 23. Iwundu matched that output in a loss to Cleveland on Jan. 6. He grabbed a season-high seven rebounds on two different occasions.