| Challenger Gwangju | 04/14 04:45 | 14 | August Holmgren v Duckhee Lee | 5-7,5-7 | |
| Challenger de Busan | 04/07 01:00 | 14 | August Holmgren v Yuki Mochizuki | 4-6,2-6 | |
| ITF M25 Calabasas | 03/21 19:40 | 26 | August Holmgren v Karue Sell | 4-6,3-6 | |
| ITF M25 Calabasas | 03/20 20:30 | 25 | August Holmgren v Cash Hanzlik | 7-6,7-5 | |
| ITF M25 Bakersfield | 03/16 17:00 | 26 | Emile Hudd v August Holmgren | Cancelled | |
| ITF M25 Bakersfield | 03/15 17:55 | 27 | [489] Ernesto Escobedo v August Holmgren [278] | 6-3,7-5 | |
| ITF M25 Bakersfield | 03/14 20:00 | 26 | Alexander Klintcharov v August Holmgren | 4-6,4-6 | |
| ITF M25 Bakersfield | 03/14 01:00 | 25 | Alexey Nesterov v August Holmgren | 4-6,4-6 | |
| Challenger de Tenerife | 02/29 10:00 | 26 | [227] Lukas Neumayer v August Holmgren [292] | 6-3,6-7,6-4 | |
| Challenger de Tenerife | 02/27 13:50 | 25 | [292] August Holmgren v Ilya Ivashka [186] | 6-3,7-5 | |
| Challenger de Tenerife | 02/26 10:00 | 19 | [246] Mitchell Krueger v August Holmgren [297] | 5-7,2-6 | |
| Challenger Tenerife - Clasificación | 02/25 10:00 | 14 | [400] Carlos Taberner v August Holmgren [297] | 2-6,7-6,4-6 | |
| Challenger de Tenerife | 02/20 10:00 | 25 | [297] August Holmgren v Jesper De Jong [141] | 6-2,4-6,3-6 | |
| Challenger de Tenerife | 02/19 10:00 | 19 | [360] Mohamed Safwat v August Holmgren [297] | 4-6,6-7 | |
| Challenger de Tenerife | 02/18 12:35 | 14 | Kenay Ortiz Gonzalez v August Holmgren | 3-6,4-6 | |
| ATP Delray Beach | 02/10 23:10 | 14 | [137] Radu Albot v August Holmgren [296] | 6-3,6-4 | |
| Copa Davis | 02/04 20:00 | 4 | [493] Ernesto Escobedo v August Holmgren [292] | 4-6,4-6 | |
| Copa Davis | 02/03 19:50 | 2 | Rodrigo Pacheco Mendez v August Holmgren | 7-6,6-7,6-3 | |
| Challenger de Tenerife | 01/15 12:20 | 19 | [296] August Holmgren v Guy Den Ouden [351] | 7-5,6-7,6-7 | |
| Challenger de Tenerife | 01/14 13:10 | 14 | August Holmgren v Ivan M Curbelo | 6-4,6-2 | |
| Challenger de Oeiras | 01/10 10:30 | 26 | [241] Alejandro Moro Canas v August Holmgren [296] | 6-3,7-5 | |
| Challenger de Oeiras | 01/08 15:15 | 25 | [296] August Holmgren v Maximilian Neuchrist [295] | Retired | |
| Challenger de Yokkaichi | 12/01 05:05 | 27 | [330] August Holmgren v Chak L C Wong [282] | 6-4,5-7,4-6 | |
| Challenger de Yokkaichi | 11/29 03:00 | 26 | [181] Zdenek Kolar v August Holmgren [330] | 4-6,2-6 | |
| Challenger de Yokkaichi | 11/28 03:20 | 25 | [454] Yusuke Takahashi v August Holmgren [330] | 3-6,3-6 | |
| Challenger de Yokkaichi | 11/27 01:00 | 19 | [337] August Holmgren v Kai Wehnelt [151] | 6-2,6-4 | |
| Challenger de Yokohama | 11/21 02:45 | 25 | [337] August Holmgren v Giovanni Fonio [299] | 4-6,1-6 | |
| Challenger de Yokohama | 11/21 02:35 | 25 | August Holmgren v James McCabe | Cancelled | |
| Challenger de Yokohama | 11/20 01:00 | 19 | [335] August Holmgren v Naoki Tajima [447] | 3-6,7-5,6-3 | |
| Challenger de Yokohama | 11/19 02:55 | 14 | [335] August Holmgren v James Trotter [389] | 7-6,3-6,6-4 |
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.