Brooks is currently No. 3 in the Polo Golf Rankings after posting an impressive 2015 season in which she had two victories and two other top-10 finishes in AJGA events. She started the season with a victory at the Polo Golf Junior Classic and added another in April at the TaylorMade-adidas Golf Junior at Innisbrook hosted by Justin Rose. She also finished T8 at the Rolex Girls Junior Championship and T2 at The PING Invitational. Brooks participated in the Wyndham Cup for the East Team and went undefeated with a record of 3-0-0 as a member of the United States PING Junior Solheim Cup Team. The senior at Lake Mary Preparatory School reached the finals of the U.S. Women’s Amateur Championship and has verbally committed to Wake Forest. She is making her fifth appearance as a Rolex Junior All-American.
| Rank | Event | R1 | R2 | R3 | R4 | Total |
| T2 | 2015 The PING Invitational | 73 | 74 | 75 | 222 | |
| T33 | 2015 U.S. Girls' Junior Championship | 75 | 69 | 144 | ||
| T8 | 2015 Rolex Girls Junior Championship | 76 | 74 | 71 | 73 | 294 |
| 1 | 2015 TaylorMade-adidas Golf Junior at Innisbrook hosted by Justin Rose | 69 | 72 | 67 | 208 | |
| T15 | 2015 ANNIKA Invitational | 73 | 75 | 71 | 219 | |
| 1 | 2014 Polo Golf Junior Classic | 75 | 72 | 147 |
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Great opportunity! U.S. Jr. Solheim Cup team member Sierra Brooks is ready for the matches: http://t.co/3zfD2s36FI
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— Morning Drive (@GCMorningDrive) September 10, 2015