Hailee Cooper, 15, carded a pair of victories this season, giving her AJGA wins in each of the last three years. She won the Bishops Gate Golf Academy Junior at Horseshoe Bay and KPMG Stacy Lewis Junior All-Star Invitational, and she also competed on the U.S. PING Junior Solheim Cup Team and West Wyndham Cup Team. As the No. 9 player in the Polo Golf Rankings, Cooper is now a three-time Rolex Junior All-American and has earned first-team honors for the first time.
| Rank | Event | R1 | R2 | R3 | R4 | Total |
| T12 | 2015 The PING Invitational | 82 | 76 | 77 | 235 | |
| T16 | 2015 Junior PGA Championship | 77 | 75 | 74 | 75 | 301 |
| T33 | 2015 U.S. Girls' Junior Championship | 70 | 72 | 142 | ||
| 1 | 2015 KPMG Stacy Lewis Junior All-Star Invitational | 71 | 71 | 75 | 217 | |
| T10 | 2015 Thunderbird International Junior | 73 | 75 | 69 | 217 | |
| 1 | 2015 Bishops Gate Golf Academy Junior at Horseshoe Bay | 73 | 74 | 71 | 218 |