Country
Birthdate
Height
Weight
Profi since
Play
Ranking's position
Points
Prize money
Birthdate
Height
Weight
Profi since
Play
Ranking's position
Points
Prize money
Japan
12.02.94, 31 years
12.02.94, 31 years
Keita Koyama vs. Hiroki Kobayashi - head to head matches
| 11.03.13 | q 1 | Keita Koyama | Hiroki Kobayashi | 6-1, 6-3 | match details |  Japan F1 | Hard |
Keita Koyama form & Hiroki Kobayashi form
Keita Koyama - last matches
.png){kind=small} Chinese Taipei - Hard | ||||
| 17.08.15 1st round | vs. Tsung-Hua Yang | 3-6, 3-6 |  | match details |
| Japan F7 - Carpet | ||||
| 15.06.15 1st round | vs. Jumpei Yamasaki | 6-4, 4-6, 1-5, - Keita Koyama - retired | | match details |
| Japan F6 - Hard | ||||
| 08.06.15 1st round | vs. Masayoshi Ono | 6-4, 2-6, 1-6 | | match details |
| Japan F5 - Clay | ||||
| 01.06.15 1st round | vs. Keisuke Watanuki | 1-6, 1-6 | | match details |
| Japan F3 - Hard | ||||
| 23.03.15 qual. | vs. Ryota Tanuma | 3-6, 2-6 | | match details |
| 23.03.15 q 1 | vs. Masaki Harada | 6-2, 7-5 |  | match details |
| 23.03.15 q 2 | vs. Ryota Hisamatsu | 6-3, 6-2 | | match details |
| Japan F2 - Hard | ||||
| 16.03.15 1st round | vs. Shintaro Imai | 0-6, 2-6 | | match details |
| Japan F1 - Hard | ||||
| 09.03.15 1st round | vs. Masato Shiga | 5-7, 7-5, 6-3 | | match details |
| 09.03.15 2nd round | vs. Duckhee Lee | 0-6, 2-6 | | match details |
| Kyoto Challenger - I. hard | ||||
| 21.02.15 q 1 | vs. Makoto Ochi | 4-6, 7-66, 5-7 | | match details |
| Toyota Challenger - Carpet | ||||
| 15.11.14 q 2 | vs. Issei Okamura | 3-6, 5-7 | | match details |
| 15.11.14 q 1 | vs. Kaichi Uchida | 6-3, 3-2, Kaichi Uchida - retired | | match details |
| Yokohama Challenger - Hard | ||||
| 07.11.14 q 1 | vs. Makoto Ochi | 6-75, 6-74 | | match details |
 Traralgon Challenger - Hard | ||||
| 28.10.14 1st round | vs. Jake Eames | 2-6, 0-6 | | match details |
| 28.10.14 qual. | vs. Chuhan Wang | 5-7, 7-64, 6-4 | | match details |
| 26.10.14 q 2 | vs. Adam Hubble | 3-6, 6-4, 7-5 | | match details |
| 25.10.14 q 1 | vs. Jeremy Beale | 6-2, 2-6, 7-62 | | match details |
 Turkey F32 - Hard | ||||
| 15.09.14 2nd round | vs. Hiroyasu Ehara | 0-6, 1-6 | | match details |
| 15.09.14 1st round | vs. Kittiphong Wachiramanowong | 6-1, 6-2 | | match details |
| Turkey F31 - Hard | ||||
| 08.09.14 1st round | vs. Michal Konecny | 7-68, 4-2, Michal Konecny - retired | | match details |
| 08.09.14 2nd round | vs. Shonigmatjon Shofayziyev | 6-2, 6-2 | | match details |
| 08.09.14 1/4 | vs. Nikala Scholtz | 6-76, 3-6 | | match details |
| Japan F8 - Clay | ||||
| 23.06.14 2nd round | vs. Yasutaka Uchiyama | 6-4, 1-6, 2-6 | | match details |
| 23.06.14 1st round | vs. Koichi Sano | 6-3, 7-5 | | match details |
| Japan F7 - Carpet | ||||
| 16.06.14 1st round | vs. Renta Tokuda | 6-4, 4-6, 1-6 | | match details |
| Japan F6 - Hard | ||||
| 09.06.14 1st round | vs. Masayoshi Ono | 7-5, 6-3 | | match details |
| 09.06.14 2nd round | vs. Takashi Saito | 3-6, 1-6 | | match details |
| Japan F5 - Clay | ||||
| 02.06.14 1/4 | vs. Bumpei Sato | 2-6, 6-4, 6-4 | | match details |
| 02.06.14 1st round | vs. Konosuke Kiryu | 6-2, 6-3 | | match details |
Hiroki Kobayashi - last matches
| Japan F7 - Carpet | ||||
| 15.06.15 q 1 | vs. Riku Ito | 4-6, 3-6 | | match details |
| Japan F1 - Hard | ||||
| 09.03.15 q 1 | vs. Aoxiong Wang | 2-6, 2-6 | | match details |
| Japan F7 - Carpet | ||||
| 16.06.14 q 1 | vs. Yuya Tsunoda | 4-6, 0-6 | | match details |
| Japan F4 - Hard | ||||
| 31.03.14 q 1 | vs. Takuya Toyono | 5-7, 4-6 | | match details |
| Japan F1 - Hard | ||||
| 10.03.14 q 2 | vs. Masayoshi Ono | 0-6, 0-6 | | match details |
| 10.03.14 q 1 | vs. Masahiro Sassa | 6-0, 6-2 | | match details |
| Japan F1 - Hard | ||||
| 11.03.13 q 1 | vs. Keita Koyama | 1-6, 3-6 | | match details |