| 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 (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.