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 |  |  | | Sebastian Mermersky |  | | Residence: | Washington, DC |
| Birthplace: | Unknown | | Age: | Unknown | | Height: | Unknown | | Plays: | Unknown | | Coaching: | Unknown |  | | Complete Bio | |
Mall Annual Jr. Tourn., May 26, 2012
 Georgetown Prep Jr. Open L3, June 2, 2012
 USTA MAS Championship #3, June 19, 2012
 USTA National Open, July 2, 2012
 USTA Regional Tourn. (New Haven), July 7, 2012
 USTA B14 National Clay Court Chmps., July 15, 2012
 USTA B14 National Chmps., August 5, 2012
 USTA Regional Tourn. (West Chester), September 1, 2012
 USTA MAS BG18 Challenger #6 L2, September 8, 2012
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Loss | Noah Fenton | | 6-0; 6-1 |
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USTA MAS B16 Challenger #6, September 15, 2012
 USTA MAS B18-16 Chmp. #4, October 6, 2012
 Pentagon City Jr. Open #1 L4, October 12, 2012
 USTA Regional Tourn. (Cincinnati), October 27, 2012
 USTA MAS B18 Challenger #7, November 10, 2012
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 64 | Win | Huntington Williams | | 6-2; 6-1 | | 32 | Loss | Shyam Venkatasubramanian | | 6-3; 6-3 |
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USTA MAS B16 Challenger #7, November 16, 2012
 USTA National Open, November 23, 2012
 USTA MAS BG16 Challenger #8, December 8, 2012
 DC Closed Youth Chmps. L4, December 14, 2012
 Boars Head Sports Club Jr., December 21, 2012
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 16 | Win | Stuart McCroskey | | 6-0; 6-4 | | Q | Loss | Justin Cerny | | 0-6; 6-3; 11-9 |
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USTA National Winter Chmps., December 27, 2012
 USTA MAS Championship #1 B14, January 5, 2013
 USTA MAS B16 Chmp. #1 L1, January 12, 2013
 USTA Regional Tourn. (Glen Cove), January 26, 2013
 USTA MAS BG16 Challenger #1, February 9, 2013
 USTA MAS B18 Challenger #1, February 16, 2013
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 64 | Loss | Alex Cauneac | 234 | Wd (inj)WJ* |
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USTA MAS B14 Chmp. #2, March 2, 2013
 USTA MAS B16 Chmp. #2, March 9, 2013
 Pentagon City Jr. Open #4 L4, March 22, 2013
 Raintree Tr. Ctr. Classic L3, March 30, 2013
 USTA BG16-14 National Spring Chmps., April 7, 2013
 USTA MAS B16 Challenger #2, April 20, 2013
 USTA MAS Challenger #2 BG18, April 27, 2013
 USTA MAS Challenger #3 B16, May 4, 2013
 USTA National Open, May 11, 2013
 USTA MAS Challenger #3 BG18, May 18, 2013
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 64 | Win | Matthew Shure | | 6-1; 6-7(5); 10-6 | | 32 | Win | Luke Tercek | + | 2-6; 7-5; 11-9 |
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+ Strong win over an ineligible player. * The ranking calculation does not count this match.
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