Stadium: Court Kuchenmeister Round: 26 Ground: Clay
| ATP Kitzbuhel | 2021/07/24 10:40 | Holger Rune v Marc Polmans | 7-6,6-3 |
| ATP Umag | 2021/07/19 14:30 | Holger Rune v Radu Albot | 6-1,3-6,2-6 |
| ATP Bastad | 2021/07/15 12:55 | Casper Ruud v Holger Rune | 6-0,6-2 |
| ATP Bastad | 2021/07/13 11:20 | Radu Albot v Holger Rune | 6-4,3-6,0-6 |
| Challenger Perugia | 2021/07/09 13:00 | Holger Rune v Vitaliy Sachko | 3-6,6-7 |
| Challenger Perugia | 2021/07/08 17:30 | Holger Rune v Lukas Klein | 6-4,6-4 |
| Challenger Perugia | 2021/07/06 12:50 | Thomas Fabbiano v Holger Rune | 1-6,6-4,2-6 |
| Challenger Milan | 2021/06/26 11:30 | Gian Marco Moroni v Holger Rune | 7-6,6-1 |
| ATP Gstaad | 2021/07/23 11:05 | Laslo Djere v Arthur Rinderknech | 6-4,6-7,6-4 |
| ATP Gstaad | 2021/07/21 13:25 | Arthur Rinderknech v Roberto Bautista-Agut | 6-2,6-4 |
| ATP Gstaad | 2021/07/20 15:30 | Arthur Rinderknech v Dominic Stephan Stricker | 6-4,6-4 |
| ATP Bastad | 2021/07/16 09:00 | Yannick Hanfmann v Arthur Rinderknech | 6-4,6-3 |
| ATP Bastad | 2021/07/14 13:20 | Arthur Rinderknech v John Millman | 6-3,3-6,6-3 |
| ATP Bastad | 2021/07/13 09:00 | Pedro Sousa v Arthur Rinderknech | 1-6,1-6 |
| ATP Bastad | 2021/07/12 09:00 | Arthur Rinderknech v Thomas Fabbiano | 6-3,6-2 |
| ATP Bastad | 2021/07/11 09:00 | Arthur Rinderknech v Oscar Jose Gutierrez | 6-4,7-5 |