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 |  |  | | Josiah Rosario |  | | Residence: | Hilo, HI |
| Birthplace: | Unknown | | Age: | Unknown | | Height: | Unknown | | Plays: | Unknown | | Coaching: | Unknown |  | | Complete Bio | |
Hilo Summer Jr. Challenger & Open, July 6, 2012
 Hilo Fall Jr. Sectional Chmps., August 31, 2012
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Loss | Everett Fan | | 6-1; 7-5 | | 16 | Loss | Cody Ching | 734 | 6-0; 6-1 |
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Hilo Fall Jr. Chal./Open, October 12, 2012
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | Q | Win | Li Aki | | 4-6; 6-1; 6-3 | | Q | Loss | Hayden Virtue | | 6-3; 6-2 | | S | Loss | Brant Yamamoto | | 7-6; 6-0 |
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Hilo Winter Challenger & Open, January 11, 2013
 DT Holua Jr. Open, February 1, 2013
 West Hawaii District Jr. Chmps., May 25, 2013
 DT USTA Nike Summer Section Chmps., June 6, 2013
 * The ranking calculation does not count this match.
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