William Guzick
| Division | 18 |
| Home Town | Greer, SC |
| USTA Section | Southern (STA) |
| Singles Line | 245 |
| Singles Seed | 0 |
| Doubles Line | 72 |
| Doubles Seed | 11 |
2007
Boys 18 Doubles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Bye | Automatic Advance |
| 2nd Rd | William Guzick / Steven Schechtman (11) def. Andrew Jung / Mac McAnulty | 6-2, 6-2 |
| 3rd Rd | Joshua Graves / Luke Marchese def. William Guzick / Steven Schechtman (11) | 6-3, 6-2 |
Boys 18 Singles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | William Guzick def. Andrew Blackner | 6-4, 6-0 |
| 2nd Rd | Jason Jung (31) def. William Guzick | 6-1, 6-1 |
Feed-In
| Round | Players | Final Score |
|---|---|---|
| 2nd Rd | William Guzick def. W. Stephen Greif | 6-2, 6-2 |
| 3rd Rd Qualifying | William Guzick def. David Fink | 6-2, 6-1 |
| 3rd Rd | Abraham Souza def. William Guzick | 6-2, 2-6, 6-4 |
2006
Boys 18 Doubles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Bye | Automatic Advance |
| 2nd Rd | William Guzick / James Moye def. Bijan Hejazi / Kevin Kaiser | 1-6, 6-3, 6-2 |
| 3rd Rd | Matthew Allare / Justin Kronauge (6) def. William Guzick / James Moye | 6-1, 6-3 |
Boys 18 Singles
Feed-In
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Bye | Automatic Advance |
| 2nd Rd | Denny Fafek def. William Guzick | 7-5, 6-2 |
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Chris Kearney def. William Guzick | 2-6, 6-2, 6-3 |
2005
Boys 16 Singles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Bye | Automatic Advance |
| 2nd Rd | William Guzick (7) def. Alexander Sanborn | 6-3, 3-6, 6-4 |
| 3rd Rd | Joey Burkhardt def. William Guzick (7) | 6-1, 6-2 |
Feed-In
| Round | Players | Final Score |
|---|---|---|
| 3rd Rd | William Guzick (7) def. Shaun Bussert | 6-0, 6-1 |
| 4th Rd Qualifying | William Guzick (7) def. Andrew Mateljan | 6-3, 6-4 |
| 4th Rd | J. Houston Barrick (13) def. William Guzick (7) | 6-3, 7-6(2) |
Boys 16 Doubles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Bye | Automatic Advance |
| 2nd Rd | William Guzick / Mateusz Kecki def. Rod Bastani / Patrick Collins | 6-3, 6-1 |
| 3rd Rd | William Guzick / Mateusz Kecki def. Bozhidar Katsarov / Bradley Klahn | 6-4, 6-7(5), 6-3 |
| 4th Rd | William Guzick / Mateusz Kecki def. Sho Matsumoto / P. Eliot Potvin | 6-0, 6-2 |
| Qtr. Final Rd | Dennis Lajola / Nathaniel Schnugg def. William Guzick / Mateusz Kecki | 2-6, 7-6(5), 6-3 |
2004
Boys 16 Singles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | Bye | Automatic Advance |
| 2nd Rd | William Guzick (28) def. David Streeter | 6-4, 6-0 |
| 3rd Rd | William Guzick (28) def. Dennis Nevolo | 6-3, 6-3 |
| 4th Rd | William Guzick (28) def. Shan Sondhu (8) | 4-6, 7-6(5), 6-3 |
| 5th Rd | Cory Parr (13) def. William Guzick (28) | 6-1, 6-0 |
Feed-In
| Round | Players | Final Score |
|---|---|---|
| 5th Rd | Jason McNaughton (31) def. William Guzick (28) | 6-0, 3-6, 6-1 |
Boys 16 Doubles
Main Draw
| Round | Players | Final Score |
|---|---|---|
| 1st Rd | William Guzick / Ryan Lissner def. Reid Carleton / Zach Skorupka | 7-5, 6-4 |
| 2nd Rd | Clint Bowles / Ted Kelly (10) def. William Guzick / Ryan Lissner | 6-4, 2-6, 6-4 |