| 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 | |
| Davise karikas | 09/16 15:40 | 5 | August Holmgren v Thiago Monteiro | Cancelled | |
| Davise karikas | 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 | |
| ITF M15 Vejle | 07/29 10:35 | 28 | August Holmgren v Alec Deckers | 4-6,6-7 |
August Holmgren (born 22 April 1998) is a Danish professional tennis player.
Holmgren has a career high ATP singles ranking of World No. 292 achieved on 29 January 2024.
Holmgren represents Denmark at the Davis Cup, where he has a W/L record of 3–0.
Holmgren played five years of college tennis for the San Diego Toreros from 2017 to 2022, receiving numerous West Coast Conference (WCC) honors. He was the nation's top-ranked player after winning the Intercollegiate Tennis Association (ITA) National Fall Championships in late 2021, and he finished his college career as the 2022 NCAA Singles Championship runner-up to Ben Shelton.
Holmgren made his ATP debut at the 2021 San Diego Open after receiving a lucky loser spot into the main draw after third seed Félix Auger-Aliassime withdrew. There, he lost to former world No. 3 Grigor Dimitrov in straight sets.