 Australia: Traralgon - Singles - Main |
|---|
| 1/16-finals | Koyama K. | Eames J. | 0:2 (2:6, 0:6) | details | 28.10.2014 |
 Japan: Sapporo - Singles - Main |
|---|
| Quarter-finals | Onozawa A. | Koyama K. | 2:0 (6:3, 6:3) | details | 29.06.2013 |
| 1/8-finals | Koyama K. | Kondo H. | 1:1 RET. (2:6, 6:4, 4:0) | details | 28.06.2013 |
| 1/16-finals | Sasai M. | Koyama K. | 0:2 (3:6, 3:6) | details | 26.06.2013 |
| Japan: Tokyo-Akishima - Singles - Main |
|---|
| 1/16-finals | Takeshima S. | Koyama K. | 2:1 (4:6, 6:3, 6:4) | details | 18.06.2013 |
| Japan: Karuizawa - Singles - Main |
|---|
| 1/16-finals | Niki T. | Koyama K. | 2:0 (6:2, 6:1) | details | 11.06.2013 |
| Japan: Tsukuba - Singles - Main |
|---|
| 1/8-finals | Koyama K. | Okamura I. | 0:2 (6:7, 6:7) | details | 04.04.2013 |
| 1/16-finals | Numajiri K. | Koyama K. | 0:2 (2:6, 2:6) | details | 03.04.2013 |
| Japan: Kofu - Singles - Main |
|---|
| 1/16-finals | Koyama K. | Nam H. | 0:2 (1:6, 1:6) | details | 27.03.2013 |
| Japan: Oarai - Singles - Main |
|---|
| 1/8-finals | Koyama K. | Kondo H. | 0:2 (3:6, 2:6) | details | 18.10.2012 |
| 1/16-finals | Otomo Y. | Koyama K. | 0:2 (4:6, 4:6) | details | 17.10.2012 |
| Japan: Kashiwa - Singles - Main |
|---|
| 1/16-finals | Koyama K. | Ito Y. | 0:2 (1:6, 3:6) | details | 10.10.2012 |
| Australia: Port Pirie - Singles - Main |
|---|
| 1/8-finals | Koyama K. | Saville L. | 0:2 (3:6, 2:6) | details | 20.09.2012 |
| 1/16-finals | Koyama K. | Bar D. | 2:1 (1:6, 7:6, 6:1) | details | 18.09.2012 |
| Japan: Sapporo - Singles - Main |
|---|
| 1/8-finals | Onozawa A. | Koyama K. | 2:0 (6:2, 6:1) | details | 28.06.2012 |
| 1/16-finals | Koyama K. | Matsuo Y. | 2:0 (6:4, 6:1) | details | 27.06.2012 |
| Japan: Tokyo-Akishima - Singles - Main |
|---|
| 1/8-finals | Koyama K. | Sato B. | 0:2 (1:6, 1:6) | details | 21.06.2012 |
| 1/16-finals | Onozawa A. | Koyama K. | 0:2 (3:6, 6:7) | details | 20.06.2012 |
 India: Kolkata - Singles - Main |
|---|
| 1/16-finals | Sipaeya S. | Koyama K. | 2:0 (6:1, 6:3) | details | 28.11.2011 |
