| Champaign challenger | Round | Result | H | A | 
		
			| 16.11. |  | Reynolds B. - Rettenmaier T. | Q-QF | 6-4, 7-6 |  |  | 
		
			| 15.11. |  | Rettenmaier T. - Vlaski A. | Q-R16 | 7-5, 7-65 |  |  | 
		
			| 14.11. |  | Rettenmaier T. - Sanchez C. | Q-1R | 6-1, 6-3 |  |  | 
		
			| Austin challenger | Round | Result | H | A | 
		
			| 09.11. |  | Hartman A. - Rettenmaier T. | Q-R16 | 6-1, 1-6, 6-2 |  |  | 
		
			| 08.11. |  | Rettenmaier T. - Quintero M. | Q-1R | 7-5, 6-4 |  |  | 
		
			| Waco challenger | Round | Result | H | A | 
		
			| 25.10. |  | Sachire R. - Rettenmaier T. | Q-1R | 6-4, 6-2 |  |  | 
		
			| Tiburon challenger | Round | Result | H | A | 
		
			| 16.10. |  | Fruttero J. - Rettenmaier T. | R16 | 6-4, 6-4 |  |  | 
		
			| 14.10. |  | Rettenmaier T. - Goldstein P. | 1R | 6-3, 1-6, 6-3 |  |  | 
		
			| 13.10. |  | Rettenmaier T. - Wilson B. | Q-QF | 6-3, 5-7, 6-2 |  |  | 
		
			| 12.10. |  | Rettenmaier T. - Ayala D. | Q-R16 | 6-0, 6-4 |  |  | 
		
			| 11.10. |  | Rettenmaier T. - Washington M. | Q-1R | 6-4, 6-3 |  |  | 
		
			| Futures 03 | Round | Result | H | A | 
		
			| 30.09. |  | Szymanski J. - Rettenmaier T. | 1R | 6-2, 6-3 |  |  | 
		
			| 23.09. |  | Medina J. - Rettenmaier T. | 1R | 7-65, 7-63 |  |  | 
		
			| 16.09. |  | Talarico A. - Rettenmaier T. | 1R | 6-3, 7-65 |  |  | 
		
			| 10.09. |  | Hill G. - Rettenmaier T. | R16 | 6-3, 6-3 |  |  | 
		
			| 09.09. |  | Rettenmaier T. - Toroman N. | 1R | 6-2, 6-4 |  |  | 
		
			| 08.09. |  | Rettenmaier T. - Klingemann C. | Q-R16 | 4-6, 6-2, 6-4 |  |  | 
		
			| 07.09. |  | Rettenmaier T. - Racioppi S. | Q-3R | 6-2, 7-5 |  |  | 
		
			| 06.09. |  | Rettenmaier T. - Swatt B. | Q-2R | 6-4, 6-4 |  |  | 
		
			| Binghamton challenger | Round | Result | H | A | 
		
			| 02.08. |  | Crowell N. - Rettenmaier T. | Q-1R | 6-2, 6-3 |  |  | 
		
			| Los Angeles | Round | Result | H | A | 
		
			| 28.07. |  | Fleishman Z. - Rettenmaier T. | Q-QF | 6-1, 6-7, 6-3 |  |  | 
		
			| 27.07. |  | Rettenmaier T. - Stewart D. | Q-R16 | 6-2, 6-3 |  |  | 
		
			| Aptos challenger | Round | Result | H | A | 
		
			| 12.07. |  | Peralta J. - Rettenmaier T. | Q-1R | 7-5, 6-0 |  |  | 
		
			| Newport | Round | Result | H | A | 
		
			| 05.07. |  | Shimada T. - Rettenmaier T. | Q-1R | 64-7, 6-4, 6-4 |  |  | 
		
			| Futures 03 | Round | Result | H | A | 
		
			| 26.06. |  | Haviland R. - Rettenmaier T. | QF | 6-1, 6-2 |  |  | 
		
			| 25.06. |  | Rettenmaier T. - Vemic D. | R16 | 6-4, 7-63 |  |  | 
		
			| 24.06. |  | Rettenmaier T. - Persico C. | 1R | 6-2, 6-2 |  |  | 
		
			| 23.06. |  | Rettenmaier T. - Gallaway H. | Q-R16 | 6-3, 6-3 |  |  | 
		
			| 22.06. |  | Rettenmaier T. - Pongsrikul J. | Q-3R | 6-0, 7-5 |  |  | 
		
			| 21.06. |  | Rettenmaier T. - Yani M. | Q-2R | 3-6, 7-61, 6-4 |  |  | 
		
			| 18.06. |  | Toroman N. - Rettenmaier T. | R16 | 2-6, 6-2, 6-1 |  |  | 
		
			| 17.06. |  | Rettenmaier T. - Corkery K. | 1R | 6-3, 6-2 |  |  | 
		
			| 11.06. |  | Hodge B. - Rettenmaier T. | R16 | 6-2, 7-6 |  |  | 
		
			| 10.06. |  | Rettenmaier T. - Hanlin M. | 1R | 7-66, 6-2 |  |  | 
		
			| 05.06. |  | Colombo A. - Rettenmaier T. | QF | 6-4, 6-4 |  |  | 
		
			| 04.06. |  | Rettenmaier T. - Ruiz-Rosales A. | R16 | 6-2, 7-5 |  |  | 
		
			| 03.06. |  | Rettenmaier T. - Ward D. | 1R | 6-3, 6-4 |  |  | 
		
			| 21.05. |  | Rodriguez F. - Rettenmaier T. | R16 | 6-3, 6-1 |  |  | 
		
			| 20.05. |  | Rettenmaier T. - Fluitt M. | 1R | 6-3, 6-1 |  |  | 
		
			| Calabasas challenger | Round | Result | H | A | 
		
			| 07.04. |  | Weiner G. - Rettenmaier T. | Q-QF | 7-6, 6-1 |  |  | 
		
			| 06.04. |  | Rettenmaier T. - Pehar M. | Q-R16 | 6-3, 6-4 |  |  | 
		
			| 05.04. |  | Rettenmaier T. - Feeder K. | Q-1R | 3-6, 7-5, 6-1 |  |  | 
		
			| Futures 03 | Round | Result | H | A | 
		
			| 01.04. |  | Goffi J. - Rettenmaier T. | 1R | 7-67, 6-0 |  |  | 
		
			| 31.03. |  | Rettenmaier T. - Bloomfield R. | Q-R16 | 6-3, 6-1 |  |  | 
		
			| 30.03. |  | Rettenmaier T. - Shields L. | Q-2R | 6-2, 6-2 |  |  | 
		
			| 29.03. |  | Rettenmaier T. - Jenkins S. | Q-1R | 6-4, 6-4 |  |  | 
		
			| 25.03. |  | Fleishman Z. - Rettenmaier T. | 1R | 7-62, 6-2 |  |  | 
		
			| 24.03. |  | Rettenmaier T. - Sachire R. | Q-R16 | 3-6, 6-2, 6-2 |  |  | 
		
			| 23.03. |  | Rettenmaier T. - Kauffmann C. | Q-2R | 6-4, 4-6, 7-5 |  |  | 
		
			| 22.03. |  | Rettenmaier T. - Igbinovia J. | Q-1R | 3-6, 6-1, 6-3 |  |  | 
		
			| 26.02. |  | Vemic D. - Rettenmaier T. | R16 | 6-3, 4-6, 6-4 |  |  | 
		
			| 25.02. |  | Rettenmaier T. - Quintero M. | 1R | 7-5, 7-5 |  |  | 
		
			| 24.02. |  | Rettenmaier T. - Crowell N. | Q-R16 | 66-7, 7-5, 6-4 |  |  | 
		
			| 23.02. |  | Rettenmaier T. - Lomakin D. | Q-2R | 6-0, 6-3 |  |  | 
		
			| 22.02. |  | Rettenmaier T. - Villareal D. | Q-1R | 6-1, 6-0 |  |  | 
		
			| 18.02. |  | Levy H. - Rettenmaier T. | 1R | 6-1, 6-3 |  |  | 
		
			| San Jose | Round | Result | H | A | 
		
			| 08.02. |  | Washington M. - Rettenmaier T. | Q-1R | 6-2, 6-3 |  |  | 
		
			| Joplin challenger | Round | Result | H | A | 
		
			| 01.02. |  | Bohaboy D. - Rettenmaier T. | Q-1R | 6-2, 4-6, 6-4 |  |  | 
		
			| Dallas challenger | Round | Result | H | A | 
		
			| 27.01. |  | Oliver G. - Rettenmaier T. | Q-QF | 7-6, 6-4 |  |  | 
		
			| 26.01. |  | Rettenmaier T. - Browne F. | Q-R16 | 6-2, 6-4 |  |  | 
		
			| 25.01. |  | Rettenmaier T. - Hernandez A. | Q-1R | 6-3, 3-6, 6-3 |  |  | 
		
			| Waikoloa challenger | Round | Result | H | A | 
		
			| 18.01. |  | Feeder K. - Rettenmaier T. | Q-1R | 7-62, 7-63 |  |  |