[6][7] Niemann planned to play at the University of South Florida, but he was unable to gain entry due to his TOEFL scores.

[11] In December 2019, Niemann played on the International team at the 2019 Presidents Cup at Royal Melbourne Golf Club in Australia.

[14] In July 2021, Niemann shot a bogey free 18-under par for 72 holes to tie with Cameron Davis and Troy Merritt for the lead at the Rocket Mortgage Classic.

[17] In December 2024, Niemann won the season-ending PIF Saudi International on the Asian Tour, beating Cameron Smith and Caleb Surratt in a playoff.

[19] He was subsequently named as the captain of the Torque GC team and finished runner-up in his first start, at LIV Golf Invitational Boston, losing a playoff to Dustin Johnson.

[22] In a playoff against Sergio García, Niemann won the tournament with a birdie on the fourth extra hole, for his first individual LIV Golf title.

Three weeks later, Augusta National Golf Club announced that Niemann was given a special invitation to compete in the 2024 Masters Tournament.