Castillo is No. 25 in the Polo Golf Rankings and has two titles to his name: the 2015 BBCN Bank Junior All-Star and the 2016 Winn Grips Heather Farr Classic hosted by Longbow Golf Club. The Valencia sophomore is a verbal commit to the University of Florida.
| Rank | Event | R1 | R2 | R3 | R4 | Total |
| T35 | 2016 Thunderbird International Junior | 73 | 73 | 79 | 225 | |
| 1 | 2016 Winn Grips Heather Farr Classic hosted by Longbow Golf Club | 69 | 67 | 72 | 208 | |
| T65 | 2015 Bobby Chapman | 76 | 75 | 151 | ||
| 1 | 2015 BBCN Bank Junior All-Star | 67 | 68 | 72 | 207 | |
| T23 | 2015 The Yang Foundation Junior at Wood Ranch | 72 | 75 | 75 | 222 | |
| T11 | 2015 The Yang Foundation Junior at Yorba Linda | 70 | 80 | 70 | 220 |
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