Won Jun Lee of Wesley Chapel, Florida, will compete in his final Wyndham Cup. The University of South Florida commit is No. 10 in the AJGA Rankings with one title at the 2014 Coca-Cola Junior All-Star at Sugarloaf. The two-time Rolex Junior All-American finished in the top 10 in all three of his 2017 AJGA tournaments. In his AJGA career, Lee has finished in the top-20 on 31 occasions.
| Rank | Event | R1 | R2 | R3 | R4 | Total |
| T4 | Thunderbird International Junior | 71 | 70 | 65 | 206 | |
| T13 | 2017 Junior Invitational at Sage Valley Golf Club | 74 | 70 | 72 | 216 | |
| T7 | TaylorMade-adidas Golf Junior at Innisbrook hosted by Justin Rose | 73 | 74 | 74 | 147 | |
| T8 | CB&I / Simplify Boys Championship at Carlton Woods | 71 | 67 | 72 | 210 | |
| T30 | 2016 Junior Orange Bowl International Golf Championship | 75 | 68 | 75 | 78 | 296 |
| T5 | 2016 Polo Golf Junior Classic | 71 | 76 | 147 | ||
| T5 | 2016 U.S. Junior Amateur Championship | 66 | 74 | 140 |