| Yokohama ITF | Round | Result | H | A | 
		
			| 30.11. |  | Sawangkaew M. - Yamaguchi M. | R16 | 6-4, 6-4 | 1.11 | 5.35 | 
		
			| 29.11. |  | Yamaguchi M. - Omae A. | 1R | 6-2, 6-2 | 1.45 | 2.44 | 
		
			| 28.11. |  | Yamaguchi M. - Feng S. | Q-R16 | 6-2, 6-2 | 1.72 | 1.93 | 
		
			| 27.11. |  | Yamaguchi M. - Li Y. | Q-1R | 6-2, 6-4 | 1.21 | 3.66 | 
		
			| Takasaki 2 ITF | Round | Result | H | A | 
		
			| 20.11. |  | Ito A. - Yamaguchi M. | Q-1R | 1-6, 7-5, 6-0 | 1.51 | 2.31 | 
		
			| Takasaki ITF | Round | Result | H | A | 
		
			| 13.11. |  | Volodko K. - Yamaguchi M. | Q-1R | 6-0, 6-3 | 1.30 | 3.00 | 
		
			| Seoul WTA | Round | Result | H | A | 
		
			| 08.10. |  | Liang E. - Yamaguchi M. | Q-QF | 6-1, 6-2 | 1.24 | 3.90 | 
		
			| 07.10. |  | Yamaguchi M. - Plipuech P. | Q-R16 | 6-4, 6-3 | 2.37 | 1.56 | 
		
			| Makinohara ITF | Round | Result | H | A | 
		
			| 05.10. |  | Shimizu A. - Yamaguchi M. | R16 | 6-3, 2-6, 7-5 | 1.51 | 2.39 | 
		
			| 03.10. |  | Yamaguchi M. - Ivanova D. | 1R | 6-3, 6-4 | 1.44 | 2.57 | 
		
			| Nanao ITF | Round | Result | H | A | 
		
			| 29.09. |  | Yang Y. - Yamaguchi M. | QF | 2-6, 6-2, 6-4 | 1.20 | 3.90 | 
		
			| 28.09. |  | Yamaguchi M. - Abe H. | R16 | 7-5, 7-65 | 1.93 | 1.63 | 
		
			| 26.09. |  | Yamaguchi M. - Otsubo H. | 1R | 6-2, 6-3 | 1.03 | 7.75 | 
		
			| Kyoto ITF | Round | Result | H | A | 
		
			| 19.09. |  | Matsuda R. - Yamaguchi M. | 1R | 7-65, 1-6, 6-3 | 2.51 | 1.39 | 
		
			| Tokyo 5 ITF | Round | Result | H | A | 
		
			| 03.09. |  | Shimizu A. - Yamaguchi M. | Q-1R | 6-3, 7-5 | 3.01 | 1.31 | 
		
			| Vigo ITF | Round | Result | H | A | 
		
			| 21.08. |  | Ozgen P. - Yamaguchi M. | Q-R16 | 6-4, 65-7, 10-5 | 1.59 | 2.14 | 
		
			| 20.08. |  | Yamaguchi M. - McGiffin T. | Q-1R | 7-5, 6-0 |  |  | 
		
			| Ourense ITF | Round | Result | H | A | 
		
			| 16.08. |  | Garcia-Perez G. - Yamaguchi M. | 1R | 6-3, 6-1 | 1.24 | 3.73 | 
		
			| 14.08. |  | Yamaguchi M. - Zanolini C. | Q-R16 | 3-6, 6-3, 10-6 | 2.13 | 1.59 | 
		
			| 13.08. |  | Yamaguchi M. - Gonzalez Garcia L. | Q-1R | 6-0, 6-1 |  |  | 
		
			| Maspalomas ITF | Round | Result | H | A | 
		
			| 07.08. |  | Pedone G. - Yamaguchi M. | Q-R16 | 6-0, 7-5 | 1.20 | 3.80 | 
		
			| 06.08. |  | Yamaguchi M. - Gram O. | Q-1R | 6-2, 6-0 | 1.03 | 7.50 | 
		
			| Foxhills ITF | Round | Result | H | A | 
		
			| 02.08. |  | Defalco J. - Yamaguchi M. | R16 | 6-4, 6-4 | 1.87 | 1.82 | 
		
			| 01.08. |  | Yamaguchi M. - Chwalinska M. | 1R | 6-0, 4-6, 6-3 | 2.99 | 1.28 | 
		
			| 01.08. |  | Yamaguchi M. - Hayashi E. | Q-R16 | 6-1, 6-2 | 1.21 | 3.72 | 
		
			| 31.07. |  | Yamaguchi M. - Ogunwale J. | Q-1R | 6-1, 6-1 | 1.30 | 3.10 | 
		
			| El Espinar ITF | Round | Result | H | A | 
		
			| 24.07. |  | Gomez C. - Yamaguchi M. | Q-R16 | 6-4, 6-4 | 1.42 | 2.56 | 
		
			| Porto 3 ITF | Round | Result | H | A | 
		
			| 17.07. |  | Da Silva Fick G. - Yamaguchi M. | Q-R16 | 6-1, 6-2 | 2.03 | 1.66 | 
		
			| 16.07. |  | Yamaguchi M. - Stromquist T. | Q-1R | 6-2, 6-1 | 1.22 | 3.50 | 
		
			| Hong Kong ITF | Round | Result | H | A | 
		
			| 05.07. |  | Chong E. - Yamaguchi M. | 1R | 5-7, 6-2, 6-2 | 1.15 | 4.65 | 
		
			| 04.07. |  | Yamaguchi M. - Shen H. | Q-R16 | 6-1, 6-0 | 1.04 | 7.67 | 
		
			| Hongkong 9 ITF | Round | Result | H | A | 
		
			| 28.06. |  | Chong E. - Yamaguchi M. | 1R | 6-1, 6-0 | 1.45 | 2.48 | 
		
			| 26.06. |  | Yamaguchi M. - Sergienko A. | Q-R16 | 6-0, 6-1 | 1.07 | 6.55 | 
		
			| Tokyo ITF | Round | Result | H | A | 
		
			| 31.05. |  | Kaji H. - Yamaguchi M. | 1R | 7-64, 6-0 | 1.21 | 3.44 | 
		
			| Karuizawa ITF | Round | Result | H | A | 
		
			| 24.05. |  | Wang Y. - Yamaguchi M. | 1R | 6-4, 6-1 | 1.04 | 8.90 | 
		
			| Kurume ITF | Round | Result | H | A | 
		
			| 17.05. |  | Wang Y. - Yamaguchi M. | 1R | 6-1, 7-5 | 1.04 | 7.86 | 
		
			| 15.05. |  | Yamaguchi M. - Saigo Y. | Q-R16 | 6-2, 6-2 |  |  | 
		
			| Fukuoka ITF | Round | Result | H | A | 
		
			| 10.05. |  | Boulter K. - Yamaguchi M. | 1R | 6-4, 6-1 | 1.05 | 7.99 | 
		
			| 08.05. |  | Yamaguchi M. - Omae A. | Q-R16 | 6-2, 6-1 |  |  | 
		
			| Gifu ITF | Round | Result | H | A | 
		
			| 04.05. |  | Saito S. - Yamaguchi M. | R16 | 5-7, 6-4, 6-3 | 1.40 | 2.70 | 
		
			| 03.05. |  | Yamaguchi M. - Kobori M. | 1R | 6-0, 2-1 | 2.46 | 1.48 | 
		
			| 01.05. |  | Yamaguchi M. - Ku Y. | Q-R16 | 6-4, 7-65 | 4.14 | 1.17 | 
		
			| 01.05. |  | Yamaguchi M. - Sato H. | Q-1R | 6-0, 6-3 | 2.21 | 1.56 | 
		
			| Osaka ITF | Round | Result | H | A | 
		
			| 12.04. |  | Okamura K. - Yamaguchi M. | 1R | 2-6, 6-4, 6-4 | 1.14 | 4.50 | 
		
			| 10.04. |  | Yamaguchi M. - Muramatsu C. | Q-R16 | 6-1, 7-66 | 1.54 | 2.23 | 
		
			| 10.04. |  | Yamaguchi M. - Kobayashi H. | Q-2R | 7-5, 6-3 |  |  | 
		
			| 09.04. |  | Yamaguchi M. - Higashitani N. | Q-1R | 6-3, 6-1 |  |  | 
		
			| Kashiwa ITF | Round | Result | H | A | 
		
			| 03.04. |  | Lee Y. - Yamaguchi M. | Q-R16 | 6-3, 6-1 | 1.72 | 1.94 | 
		
			| 02.04. |  | Yamaguchi M. - Saito S. | Q-1R | 6-1, 6-1 |  |  | 
		
			| Kofu ITF | Round | Result | H | A | 
		
			| 28.03. |  | Garcia-Perez G. - Yamaguchi M. | Q-R16 | 6-3, 5-7, 11-9 |  |  | 
		
			| 28.03. |  | Yamaguchi M. - Shibata S. | Q-2R | 6-4, 6-3 |  |  | 
		
			| 27.03. |  | Yamaguchi M. - Iwasa N. | Q-1R | 6-1, 6-3 |  |  | 
		
			| Bengaluru 4 ITF | Round | Result | H | A | 
		
			| 09.03. |  | Silva E. - Yamaguchi M. | R16 | 6-2, 6-0 | 1.26 | 3.50 | 
		
			| 08.03. |  | Yamaguchi M. - Welker E. | 1R | 4-6, 6-2, 6-3 | 1.77 | 1.94 | 
		
			| 06.03. |  | Yamaguchi M. - Imamura S. | Q-R16 | 4-6, 6-4, 6-4 | 2.22 | 1.56 | 
		
			| 05.03. |  | Yamaguchi M. - Bavisetti S. | Q-1R | 6-4, 6-3 | 1.32 | 3.07 | 
		
			| Kuching ITF | Round | Result | H | A | 
		
			| 03.03. |  | Feng S. - Yamaguchi M. | QF | 6-2, 6-3 | 1.99 | 1.73 | 
		
			| 02.03. |  | Yamaguchi M. - Chen M. | R16 | 6-0, 6-2 | 1.16 | 4.46 | 
		
			| 01.03. |  | Yamaguchi M. - Ozeki A. | 1R | 6-1, 6-1 | 1.11 | 5.38 | 
		
			| Kuala Lumpur ITF | Round | Result | H | A | 
		
			| 21.02. |  | Xun F. - Yamaguchi M. | 1R | 5-7, 6-0, 6-2 | 1.59 | 2.18 | 
		
			| Perak ITF | Round | Result | H | A | 
		
			| 17.02. |  | Tararudee L. - Yamaguchi M. | QF | 6-3, 6-0 | 1.07 | 7.10 | 
		
			| 16.02. |  | Yamaguchi M. - Feng S. | R16 | 6-2, 3-0 | 2.07 | 1.67 | 
		
			| 14.02. |  | Yamaguchi M. - Bhasin S. | 1R | 6-0, 6-0 | 1.06 | 7.37 | 
		
			| Pune ITF | Round | Result | H | A | 
		
			| 23.01. |  | Kozaki F. - Yamaguchi M. | Q-R16 | 3-6, 6-1, 6-3 | 2.48 | 1.46 | 
		
			| 22.01. |  | Yamaguchi M. - Sawant M. | Q-1R | 6-2, 6-0 | 1.05 | 7.46 | 
		
			| Bhopal ITF | Round | Result | H | A | 
		
			| 15.01. |  | Kawamura M. - Yamaguchi M. | Q-1R | 7-65 | 1.82 | 1.82 |