Head to Head includes singles and doubles results.
| 05/12/10 | Eduardo Castillo over Isayah Johnson | 6-2; 3-6; 6-3 | |
| 04/19/10 | Isayah Johnson over Eduardo Castillo | 6-3; 6-3 | |
| 01/15/10 | Isayah Johnson over Eduardo Castillo | 6-2; 6-1 | |
| 12/08/09 | Isayah Johnson over Eduardo Castillo | 6-1; 4-6; 6-4 | |
| 10/29/09 | Isayah Johnson over Eduardo Castillo | 7-6; 6-4 | |
| 10/07/09 | Isayah Johnson over Eduardo Castillo | 6-2; 6-3 | |
| 09/21/09 | Isayah Johnson over Eduardo Castillo | 6-1; 7-5 | |
| 09/16/09 | Isayah Johnson over Eduardo Castillo | 6-7; 6-1; 6-4 | |
| 09/10/09 | Eduardo Castillo over Isayah Johnson | 7-6; 3-6; 6-1 | |
| 09/03/09 | Eduardo Castillo over Isayah Johnson | 7-6; 6-3 | |
| 08/24/09 | Isayah Johnson over Eduardo Castillo | 6-4; 2-6; 6-4 | |
| 08/07/09 | Isayah Johnson over Eduardo Castillo | 2-6; 7-6; 6-1 | |
| 08/04/09 | Eduardo Castillo over Isayah Johnson | 5-7; 6-3; 6-3 | |
| 07/28/09 | Isayah Johnson over Eduardo Castillo | 6-1; 6-1 | |
| 07/24/09 | Isayah Johnson over Eduardo Castillo | 6-4; 1-6; 6-3 | |
| 07/05/09 | Isayah Johnson over Eduardo Castillo | 6-3; 4-6; 6-3 | |
| 06/28/09 | Eduardo Castillo over Isayah Johnson | 6-2; 6-3 | |
| 06/12/09 | Isayah Johnson over Eduardo Castillo | 6-3; 1-6; 6-2 | |
| 05/30/09 | Isayah Johnson over Eduardo Castillo | 6-4; 5-7; 6-4 | |
| 05/23/09 | Isayah Johnson over Eduardo Castillo | 6-1; 6-2 | |
| 05/20/09 | Eduardo Castillo over Isayah Johnson | 6-4; 2-6; 6-0 | |
| 04/14/09 | Eduardo Castillo over Isayah Johnson | 5-7; 6-4; 6-1 | |
| 04/10/09 | Eduardo Castillo over Isayah Johnson | 6-2; 6-0 | |
| 03/31/09 | Eduardo Castillo over Isayah Johnson | 6-2; 7-6 | |
| 03/25/09 | Eduardo Castillo over Isayah Johnson | 3-6; 6-3; 6-3 | |
| 03/13/09 | Isayah Johnson over Eduardo Castillo | 7-6; 1-6; 6-4 | |
| 03/07/09 | Eduardo Castillo over Isayah Johnson | 6-7; 6-1; 6-4 | |
| 02/24/09 | Eduardo Castillo over Isayah Johnson | 6-0; 6-1 | |
| 01/25/09 | Isayah Johnson over Eduardo Castillo | 1-6; 7-5; 7-6 | |
| 01/09/09 | Eduardo Castillo over Isayah Johnson | 1-6; 7-6; 6-4 | |
| 12/26/08 | Isayah Johnson over Eduardo Castillo | 6-2; 6-0 | |
| 12/13/08 | Eduardo Castillo over Isayah Johnson | 7-6; 6-0 | |
| 12/09/08 | Eduardo Castillo over Isayah Johnson | 6-1; 6-2 | |
| 12/04/08 | Isayah Johnson over Eduardo Castillo | 6-3; 1-6; 6-4 | |
| 11/14/08 | Isayah Johnson over Eduardo Castillo | 6-2; 6-2 | |
| 10/17/08 | Eduardo Castillo over Isayah Johnson | 6-2; 6-0 | |
| 10/03/08 | Eduardo Castillo over Isayah Johnson | 6-1; 7-6 | |
| 08/29/08 | Eduardo Castillo over Isayah Johnson | 7-5; 6-0 | |
| 08/18/08 | Eduardo Castillo over Isayah Johnson | 6-1; 6-2 |
