Will McNair Jr. spent five seasons in the NCAA — from 2019 to 2022 he played for the New Mexico State Aggies, in the 2022/23 season he suited up for the Mississippi State Bulldogs, and in the 2023/24 season for the Kansas State Wildcats. He appeared in a total of 149 NCAA games, averaging 4.8 points and 3.8 rebounds per game. Statistically, he was most productive with the Kansas State Wildcats, where he averaged 8.0 points, 5.4 rebounds, and 1.2 blocks over 33 games.

The 2024/25 season was his first in Europe, where he played in the Turkish second division for OGM Ormanspor. He appeared in 31 games, finishing as the team’s leading scorer and rebounder with averages of 15.3 points and 10.1 rebounds per game. He recorded a double-double in 15 games and delivered his best performance on October 5, when he posted 21 points and 17 rebounds against Cayirova Belediye, good for a performance index rating of 35. Prior to the 2025/26 season, he joined Yalovaspor, appearing in four games and averaging 16.5 points and 10.0 rebounds per contest.