Niemann, a University of South Florida commit, earned his first Rolex Junior All-America honors after a 2016 campaign that included two victories in national junior golf events. His first win of the year came at the Sergio Garcia Foundation Junior Championship, and his second came at the IMG Academy Junior World Championship. The high school senior is No. 8 in the Polo Golf Rankings.
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| Rank | Event | R1 | R2 | R3 | R4 | Total |
| T17 | 2016 The PING Invitational | 80 | 70 | 77 | 227 | |
| T17 | 2016 U.S. Junior Amateur Championship | 73 | 69 | 142 | ||
| 1 | 2016 IMG Academy Junior World Championship | 70 | 72 | 67 | 67 | 276 |
| 1 | 2016 Sergio Garcia Foundation Junior Championship | 71 | 68 | 139 | ||
| T24 | 2016 Junior Invitational at Sage Valley Golf Club | 75 | 73 | 76 | 224 | |
| T2 | 2015 Junior Orange Bowl International Golf Championship | 69 | 73 | 70 | 72 | 284 |