INFO: click on player name to show detailed player statistics
Keita Koyama vs. Hiroyasu Ehara - H2H matches
| 15.09.14 | 2nd round | Hiroyasu Ehara | Keita Koyama | 6-0, 6-1 | match details |  Turkey F32 | Hard |
Keita Koyama form & Hiroyasu Ehara 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 q 2 | vs. Ryota Hisamatsu | 6-3, 6-2 |  | match details |
| 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 |
| Japan F2 - Hard | ||||
| 16.03.15 1st round | vs. Shintaro Imai | 0-6, 2-6 | | match details |
| Japan F1 - Hard | ||||
| 09.03.15 2nd round | vs. Duckhee Lee | 0-6, 2-6 | | match details |
| 09.03.15 1st round | vs. Masato Shiga | 5-7, 7-5, 6-3 | | 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 1 | vs. Kaichi Uchida | 6-3, 3-2, Kaichi Uchida - retired | | match details |
| 15.11.14 q 2 | vs. Issei Okamura | 3-6, 5-7 | | 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 qual. | vs. Chuhan Wang | 5-7, 7-64, 6-4 | | match details |
| 28.10.14 1st round | vs. Jake Eames | 2-6, 0-6 | | 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 1st round | vs. Kittiphong Wachiramanowong | 6-1, 6-2 | | match details |
| 15.09.14 2nd round | vs. Hiroyasu Ehara | 0-6, 1-6 | | match details |
| Turkey F31 - Hard | ||||
| 08.09.14 1/4 | vs. Nikala Scholtz | 6-76, 3-6 | | match details |
| 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 |
| Japan F8 - Clay | ||||
| 23.06.14 1st round | vs. Koichi Sano | 6-3, 7-5 | | match details |
| 23.06.14 2nd round | vs. Yasutaka Uchiyama | 6-4, 1-6, 2-6 | | 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 2nd round | vs. Takashi Saito | 3-6, 1-6 | | match details |
| 09.06.14 1st round | vs. Masayoshi Ono | 7-5, 6-3 | | match details |
| Japan F5 - Clay | ||||
| 02.06.14 1/2 | vs. Takuto Niki | 2-6, 1-6 | | match details |
| 02.06.14 2nd round | vs. Masato Shiga | 4-6, 6-4, 6-3 | | match details |
Hiroyasu Ehara - last matches
| M25 Takasaki - Hard | ||||
| 21.09.23 2nd round | vs. Collin Altamirano | 4-6, 1-6 | | match details |
| 19.09.23 1st round | vs. Yusuke Takahashi | 7-5, 6-4 | | match details |
| 18.09.23 qual. | vs. Yusuke Kusuhara | 1-6, 6-4, 10-6 | | match details |
| 17.09.23 q 1 | vs. Ryo Tabata | 6-2, 6-1 | | match details |
| M25 Sapporo - Hard | ||||
| 10.09.23 q 1 | vs. Hiroki Sakagawa | 7-66, 1-6, 6-10 | | match details |
| M25 Kashiwa - Hard | ||||
| 05.04.23 1st round | vs. Rimpei Kawakami | 0-6, 0-6 | | match details |
| 03.04.23 qual. | vs. Naoki Tajima | 6-4, 6-2 | | match details |
| 02.04.23 q 1 | vs. Yuichiro Inui | 6-4, 6-2 | | match details |
| M15 Antalya - Clay | ||||
| 14.03.23 qual. | vs. Gabriele Pennaforti | 0-6, 2-6 | | match details |
| 13.03.23 q 2 | vs. Jiri Jenicek | 6-2, 6-1 | | match details |
| 12.03.23 q 1 | vs. Filippo Verdese | 6-1, 6-1 | | match details |
| M15 Antalya - Clay | ||||
| 05.03.23 q 1 | vs. Stepan Mruzek | 0-3, - Hiroyasu Ehara - retired | | match details |
| M15 Antalya - Clay | ||||
| 01.03.23 1st round | vs. Dominik Kellovsky | 3-6, 2-6 | | match details |
| 28.02.23 qual. | vs. Igor Gimenez | 7-64, 6-3 | | match details |
| 27.02.23 q 2 | vs. Egor Khotchenkov | 6-2, 6-4 | | match details |
| 26.02.23 q 1 | vs. Arkady Svyatov | 6-2, 6-1 | | match details |
| M25 Kashiwa - Hard | ||||
| 29.09.22 2nd round | vs. Rimpei Kawakami | 2-6, 4-6 | | match details |
| 27.09.22 1st round | vs. Naoki Tajima | 6-2, 4-6, 4-2, Naoki Tajima - retired | | match details |
 M15 Cancun - Hard | ||||
| 03.06.22 1st round | vs. Taha Baadi | 3-6, 4-6 | | match details |
| M15 Cancun - Hard | ||||
| 24.05.22 1st round | vs. Alan Raul Sau Franco | 7-64, 3-6, 4-6 | | match details |
| M15 Cancun - Hard | ||||
| 20.05.22 1/4 | vs. Haoyuan Huang | 4-6, 5-7 | | match details |
| 19.05.22 2nd round | vs. Peter Bertran | 6-1, 4-1, Peter Bertran - retired | | match details |
| 18.05.22 1st round | vs. Alan Raul Sau Franco | 6-4, 6-2 | | match details |
 M25 Nonthaburi - Hard | ||||
| 26.01.20 q 1 | vs. Adam El Mihdawy | 3-6, 2-6 | | match details |
 M15 Hong - Hard | ||||
| 08.01.20 1st round | vs. Arthur De Greef | 2-6, 2-6 | | match details |
 M25 Tay - Hard | ||||
| 09.10.19 1st round | vs. Daniel Nguyen | 4-6, 2-6 | | match details |
| M15 Hua - Hard | ||||
| 30.08.19 1/4 | vs. Ryan Peniston | 6-74, 0-1, - Hiroyasu Ehara - retired | | match details |
| 29.08.19 2nd round | vs. Yuttana Charoenphon | 6-1, 6-0 | | match details |
| 27.08.19 1st round | vs. Seon Yong Han | 6-1, 7-5 | | match details |
 M15 Jakarta - Hard | ||||
| 21.08.19 1st round | vs. Haadin Bava | 5-7, 4-6 | | match details |
