| |  | 
  | |  |
 |  |  | | Sebastian Mermersky |  | | Residence: | Washington, DC |
| Birthplace: | Unknown | | Age: | Unknown | | Height: | Unknown | | Plays: | Unknown | | Coaching: | Unknown |  | | Complete Bio | |
USTA MAS B12 Chmp. #1, January 15, 2011
 USTA MAS B14 Chmp. #1 L1, January 29, 2011
 USTA MAS B14 Challenger #1, February 19, 2011
 USTA BG12 National Spring Chmps., April 10, 2011
 USTA National Open, May 14, 2011
 USTA MAS B16 Challenger #3, May 21, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Loss | Harry Hoven | | 6-1; 4-6; 6-4 |
|  |  |
Mall Annual Jr. Tourn., May 28, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 64 | Win | P.J. Anderson | | 6-0; 6-1 | | 32 | Win | Adam Fenton | + | 6-4; 6-4 | | 16 | Win | Blest Jones | | 6-3; 6-3 | | Q | Win | Nik Padmanabhan | + | 7-5; 6-2 | | S | Win | Alexander Reinke | | 6-1; 6-1 | | F | Win | Jack Thomas | + | 3-6; 7-5; 15-13 |
|  |  |
Regency Jr. Open #9 L4, June 3, 2011
 USTA MAS BG12 Chmp. #3, June 22, 2011
 USTA MAS B14 Challenger #4, July 9, 2011
 USTA B12 National Clay Court Chmps., July 17, 2011
 USTA BG12 Zonals - Knoxville, July 27, 2011
 USTA MAS B16 Challenger #5, August 20, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 64 | Win | Kieran Raphael | | 6-2; 7-6(3) | | 32 | Loss | Fred Mesmer | | 5-7; 6-1; 6-0 |
|  |  |
Potomac Jr. Open #8 L4, August 26, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 16 | Win | Payam Ahmadi | 366 | 1-6; 7-6(7-4); 12-10 | | Q | Win | Eric Dubrow | 1246 | 6-3; 6-2 | | S | Win | Matthew Fine | | Wd (inj)WJ* | | F | Win | Josh Albertson | | 6-3; 6-3 |
|  |  |
Fort Lincoln Jr. Open L4, September 3, 2011
 USTA MAS B14 Challenger #6, September 10, 2011
 NIKE Jr. Tour USA Masters, September 16, 2011
 USTA MAS B14 Championship #4, October 8, 2011
 USTA MAS B16 Championship #4, October 15, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Loss | Francis Tiafoe | 2 | 6-1; 6-2 | | 1 | Win | Garrett Weinstein | | 1-6; 6-1; 6-3 | | 2 | Loss | Sean Ngo | | 6-3; 6-3 |
|  |  |
RCC Clay Court MAS B16 Challenger #7, November 4, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Loss | Justin Cerny | | 6-1; 6-3 |
|  |  |
USTA MAS B14 Challenger #7, November 12, 2011
 USTA National Open, November 25, 2011
 USTA MAS B14 Challenger #8, December 3, 2011
 USTA MAS BG16 Challenger #8, December 10, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Win | Wesley Wong | + | 4-3Ret (ill)RI | | 16 | Loss | Fred Mesmer | | 7-5; 6-2 |
|  |  |
50th Jr. Orange Bowl Int'l. Tennis Chmps, December 14, 2011
 Ken Guendel Mem. Holiday Classic L3, December 26, 2011
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Win | Payam Ahmadi | 366 | 7-5; 6-2 | | 16 | Win | Daniel Chen | | 6-4; 6-3 | | Q | Win | Miles Hendricks | | 6-4; 6-3 | | S | Win | Kevin Chen | | 7-5; 6-3 | | F | Loss | Nik Padmanabhan | | 6-0; 6-4 |
|  |  |
+ Strong win over an ineligible player. * The ranking calculation does not count this match.
| |  |  | |