| |  | 
  | |  |
 |  |  | | Derek Klein |  | | Residence: | San Diego, CA |
| Birthplace: | Unknown | | Age: | Unknown | | Height: | Unknown | | Plays: | Unknown | | Coaching: | Unknown |  | | Complete Bio | |
Esme Pearson Memorial Tourn., January 3, 2009
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 128 | Win | Nick Lench | 2423 | 10-5 | | 64 | Win | Blake Cummins | | 10-5 | | 32 | Win | Michael Lowe | 532 | 10-7 | | 16 | Loss | Michael Rabinovich | | 7-6; 6-3 |
|  |  |
58th Gene Jung Whittier Midwinter, January 17, 2009
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 256 | Win | Patrick Lipscomb | | 7-5; 6-3 | | 128 | Win | Eric Kong | | 6-1; 6-0 | | 64 | Loss | Francesco D'Arcangelo | | 6-4; 6-3 |
|  |  |
64th Fullerton Jr. Tourn., January 31, 2009
 60th San Diego Metropolitan Tourn., February 14, 2009
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Win | Trevor Donovan | | 6-3; 6-2 | | 16 | Win | Aaron Marvin | 865 | 7-6; 7-5 | | Q | Loss | Nikolas Marino | | 6-2; 6-4 |
|  |  |
28th Woody Hunt Mem. South Bay Tourn., February 28, 2009
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 256 | Loss | Stefan Menichella | 235 | 6-4; 6-0 | | 128 | Win | Giancarlo Battaglia | | 0-6; 6-4; 10-6 |
|  |  |
53rd Long Beach Jr. Tourn., March 14, 2009
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 256 | Win | Adrian Huffard | | Wd (inj)WJ* | | 128 | Win | Blake Cummins | | 7-5; 1-0Ret (inj)RJ | | 64 | Win | Pete Taratikhumporn | 617 | 3-6; 6-1; 6-4 | | 32 | Loss | Kona Luu | 336 | 6-3; 7-5 |
|  |  |
75th Harper Ink Mem. Tourn., March 28, 2009
 25th Anaheim TC Tourn., May 2, 2009
 USTA National Opens, May 16, 2009
 Quiksilver Jr. Chmps., May 23, 2009
 107th SoCal Sectional Chmps., June 20, 2009
 USTA National Opens, July 4, 2009
 USTA Zone Team BG16 - Salt Lake City, July 29, 2009
 West Coast Chmps., August 3, 2009
 25th Los Caballeros Jr., September 12, 2009
 46th Northridge-Matador Tourn., September 26, 2009
 Dunlop Jr. Chmps., October 10, 2009
 The Orange County Jr. Open, October 24, 2009
 Thanksgiving Vacation Jr. Tourn., November 14, 2009
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 32 | Win | Ben Hammond | | 6-4; 6-1 | | 16 | Win | Michael Saria | | 6-4; 6-1 | | Q | Loss | Kaiser Cesar De Leon | | 6-2; 6-3 |
|  |  |
USTA National Open, November 26, 2009
 Homer Peabody Holiday Open Tourn., December 5, 2009
 California Bowl, December 19, 2009
 * The ranking calculation does not count this match.
| |  |  | |