Ranked No. 9 in the Polo Golf Rankings, Lee is a first-time Rolex Junior All-American. During the 2015 season, the 17-year-old recorded a victory at the Wells Fargo Junior Classic presented by Mizuno and a T6 finish at the FJ Invitational. The senior also recorded a top national junior golf finish when he took second at the Bobby Chapman Junior Invitational and competed at the Wyndham Cup.
| Rank | Event | R1 | R2 | R3 | R4 | Total |
| T27 | 2015 The PING Invitational | 79 | 80 | 78 | 237 | |
| 2 | 2015 Bobby Chapman | 66 | 62 | 128 | ||
| T16 | 2015 The Junior PLAYERS Championship presented by TaylorMade-adidas Golf | 72 | 73 | 75 | 220 | |
| T6 | 2015 FJ Invitational | 70 | 66 | 74 | 72 | 282 |
| T43 | 2015 Thunderbird International Junior | 80 | 74 | 75 | 229 | |
| T24 | 2015 Scott Robertson Memorial | 69 | 76 | 71 | 216 | |
| 1 | 2015 Wells Fargo Junior Classic presented by Mizuno | 66 | 66 | |||
| T16 | 2015 CB&I Boys Championship at Carlton Woods | 68 | 77 | 78 | 223 | |
| 2 | 2014 Jones Cup Junior Invitational | 68 | 71 | 70 | 209 |