| Challenger - Yokohama | 11/20 01:00 | 19 | [335] August Holmgren v Naoki Tajima [447] | 3-6,7-5,6-3 | |
| Challenger - Yokohama | 11/19 02:55 | 14 | [335] August Holmgren v James Trotter [389] | 7-6,3-6,6-4 | |
| Challenger - Kobe | 11/16 04:30 | 26 | [335] August Holmgren v Luca Nardi [128] | 3-6,6-3,5-7 | |
| Challenger - Kobe | 11/14 02:45 | 25 | [335] August Holmgren v Moez Echargui [279] | 6-4,6-3 | |
| Challenger - Kobe | 11/13 04:35 | 19 | [467] Yusuke Takahashi v August Holmgren [392] | 4-6,4-6 | |
| Challenger - Kobe | 11/12 06:00 | 14 | [392] August Holmgren v Omni Kumar [357] | 6-2,6-3 | |
| Challenger - Matsuyama | 11/11 05:15 | 28 | [86] Taro Daniel v August Holmgren [392] | 7-6,6-2 | |
| Challenger - Matsuyama | 11/11 01:00 | 27 | [179] Duje Ajdukovic v August Holmgren [392] | 5-7,6-3,6-7 | |
| Challenger - Matsuyama | 11/09 03:10 | 26 | [309] Yasutaka Uchiyama v August Holmgren [392] | 6-7,6-7 | |
| Challenger - Matsuyama | 11/08 01:00 | 25 | [392] August Holmgren v Marc Polmans [158] | 6-0,6-4 | |
| Challenger - Matsuyama | 11/06 01:00 | 19 | [368] Egor Gerasimov v August Holmgren [455] | 4-6,6-7 | |
| ITF - M25 - Harlingen | 10/29 17:00 | 29 | Raphael Perot v August Holmgren | 3-6,7-6,1-6 | |
| ITF - M25 - Harlingen | 10/28 16:00 | 28 | Kyle Kang v August Holmgren | 5-7,4-6 | |
| ITF - M25 - Harlingen | 10/27 16:50 | 27 | Keshav Chopra v August Holmgren | 2-6,6-7 | |
| ITF - M25 - Harlingen | 10/26 17:00 | 26 | Luc Fomba v August Holmgren | 3-6,6-3,3-6 | |
| ITF - M25 - Harlingen | 10/25 14:00 | 25 | Arvid Nordquist v August Holmgren | 7-6,4-6,5-7 | |
| Challenger - Fairfield | 10/10 20:50 | 25 | [153] Christian Harrison v August Holmgren [433] | 6-4,6-4 | |
| Challenger - Fairfield | 10/09 17:00 | 19 | [376] Evan Zhu v August Holmgren [433] | 6-7,4-6 | |
| Challenger - Fairfield | 10/08 18:15 | 14 | Mili Poljicak v August Holmgren | 2-6,4-6 | |
| Challenger - Tiburon | 10/01 17:00 | 14 | [425] Alexandr Cozbinov v August Holmgren [412] | 6-3,6-4 | |
| Challenger - Charleston | 09/27 14:00 | 25 | [250] Aziz Dougaz v August Holmgren [412] | 6-3,6-4 | |
| Challenger - Charleston | 09/25 14:00 | 19 | [399] Federico Agustin Gomez v August Holmgren [409] | 0-6,5-7 | |
| Challenger - Charleston | 09/24 17:10 | 14 | Brayden Schnur v August Holmgren | 7-6,5-7,6-7 | |
| Davis Cup | 09/16 15:40 | 5 | August Holmgren v Thiago Monteiro | Cancelled | |
| Davis Cup | 09/15 17:25 | 2 | [412] August Holmgren v Thiago Seyboth Wild [76] | 4-6,2-6 | |
| Challenger - Cassis | 09/05 13:15 | 25 | [411] August Holmgren v Giulio Zeppieri [136] | 3-6,3-6 | |
| Challenger - Cassis | 09/04 09:55 | 19 | [411] August Holmgren v Elmer Moller [427] | 6-3,6-2 | |
| Challenger - Cassis | 09/03 12:10 | 14 | August Holmgren v Leonardo Rossi | 7-6,6-3 | |
| Challenger - Mallorca | 08/29 08:00 | - | [326] Maxime Janvier v August Holmgren [411] | 6-3,6-4 | |
| Challenger - Mallorca | 08/28 10:20 | 14 | Ivan Ivanov v August Holmgren | 4-6,5-7 |
August Holmgren (* 22. April 1998 in Espergærde) ist ein dänischer Tennisspieler.