Joan Castillo
| Height: | 5-7 |
| Year: | Sr |
| Hometown: | Santo Domingo, Dominican Republic |
| High School: | St. Joseph School |
| Previous College: | Nichols |
2015-16: NE-10 Commissioner's Honor Roll spring semester
High School: Gradute of St. Joseph School.
Personal: Born July 25, 1995 in Santo Domingo, Dominican Republic. Son of Elizabeth de los Santos and Humberto Castillo of Dorchester, Massachusetts. Chose Stonehill for the exposure to many majors and the location is close to his family. Lists Rafael Nadal as his favorite athlete.
Singles
| Season | Overall | Dual | Tour. | NE-10 | 1 | 2 | 3 | 4 | 5 | 6 |
| 2016-17 | 0-1 | 0-1 | 0-0 | 0-0 | -- | -- | 0-1 | -- | -- | -- |
| Totals | 0-1 | 0-1 | 0-0 | 0-0 | -- | -- | 0-1 | -- | -- | -- |
Doubles
| Season | Overall | Dual | Tour. | NE-10 | 1 | 2 | 3 |
| 2016-17 | 3-1 | 0-0 | 3-1 | 0-0 | -- | -- | -- |
| Totals | 3-1 | 0-0 | 3-1 | 0-0 | -- | -- | -- |