6‑Nov‑2023 | M25 Austin TX | Hard | R32 | 769 | 1531 | (Q)Siem Woldeab [USA] d. Sigsgaard | 7-6(5) 4-6 6-3 | | | | | | | | | |
30‑Oct‑2023 | M15 Fayetteville AR | Hard | R32 | 774 | 879 | Derek Pham [AUS] d. (9)Sigsgaard | 4-6 6-4 6-2 | | | | | | | | | |
9‑Oct‑2023 | M15 Doha | Hard | R32 | 777 | 1317 | Alexey Zakharov [RUS] d. Sigsgaard | 6-3 3-6 6-3 | | | | | | | | | |
2‑Oct‑2023 | M15 Doha | Hard | SF | 777 | 497 | (3)Marat Sharipov [RUS] d. Sigsgaard | 6-3 6-4 | | | | | | | | | |
2‑Oct‑2023 | M15 Doha | Hard | QF | 777 | 476 | Sigsgaard d. (2)Bogdan Bobrov [RUS] | 6-3 7-5 | | | | | | | | | |
2‑Oct‑2023 | M15 Doha | Hard | R16 | 777 | 882 | Sigsgaard d. Koray Kirci [TUR] | 7-6(7) 6-1 | | | | | | | | | |
2‑Oct‑2023 | M15 Doha | Hard | R32 | 777 | | Sigsgaard d. (WC)Issa Alharrasi [QAT] | 6-0 6-1 | | | | | | | | | |
25‑Sep‑2023 | M25 Falun | Hard | R32 | 779 | 526 | (8)Giles Hussey [GBR] d. Sigsgaard | 4-6 6-2 7-5 | | | | | | | | | |
31‑Jul‑2023 | M15 Eindhoven | Clay | R16 | 779 | 694 | (5)Tom Gentzsch [GER] d. Sigsgaard | 2-6 6-4 6-3 | | | | | | | | | |
31‑Jul‑2023 | M15 Eindhoven | Clay | R32 | 779 | | Sigsgaard d. (WC)Pepijn Bastiaansen [NED] | 6-2 6-3 | | | | | | | | | |
24‑Jul‑2023 | M15 Vejle | Clay | SF | 782 | 455 | (2)Elmer Moller [DEN] d. Sigsgaard | 6-2 6-3 | | | | | | | | | |
24‑Jul‑2023 | M15 Vejle | Clay | QF | 782 | 1579 | Sigsgaard d. (Q)Maxence Rivet [FRA] | 6-3 6-1 | | | | | | | | | |
24‑Jul‑2023 | M15 Vejle | Clay | R16 | 782 | 722 | Sigsgaard d. (7)Georgii Kravchenko [UKR] | 6-4 6-3 | | | | | | | | | |
24‑Jul‑2023 | M15 Vejle | Clay | R32 | 782 | 1115 | Sigsgaard d. (Q)Eero Vasa [FIN] | 7-6(8) 6-2 | | | | | | | | | |
12‑Jun‑2023 | M25 RisskovAarhus | Clay | QF | 783 | 467 | (7)Ergi Kirkin [TUR] d. Sigsgaard | 6-7(4) 6-3 6-4 | | | | | | | | | |
12‑Jun‑2023 | M25 RisskovAarhus | Clay | R16 | 783 | 379 | Sigsgaard d. (3)Karl Friberg [SWE] | 6-3 6-0 | | | | | | | | | |
12‑Jun‑2023 | M25 RisskovAarhus | Clay | R32 | 783 | | Sigsgaard d. (Q)Michael Minasyan [SWE] | 6-3 6-2 | | | | | | | | | |
24‑Apr‑2023 | M25 Nottingham | Hard | QF | 810 | 474 | (7)August Holmgren [DEN] d. Sigsgaard | 7-5 6-4 | | | | | | | | | |
24‑Apr‑2023 | M25 Nottingham | Hard | R16 | 810 | 346 | Sigsgaard d. (1)Clement Chidekh [FRA] | 6-4 6-3 | | | | | | | | | |
24‑Apr‑2023 | M25 Nottingham | Hard | R32 | 810 | 558 | Sigsgaard d. Mark Whitehouse [GBR] | 6-4 6-1 | | | | | | | | | |
27‑Mar‑2023 | M25 Saint Dizier | Hard | R16 | 809 | 844 | Florian Broska [GER] d. Sigsgaard | 7-6(7) 6-3 | | | | | | | | | |
27‑Mar‑2023 | M25 Saint Dizier | Hard | R32 | 809 | 509 | Sigsgaard d. (5)Tristan Lamasine [FRA] | 7-6(5) 6-4 | | | | | | | | | |
20‑Mar‑2023 | M25 Toulouse-Balma | Hard | R16 | 809 | 451 | (5)Goncalo Oliveira [VEN] d. Sigsgaard | 6-3 6-3 | | | | | | | | | |
20‑Mar‑2023 | M25 Toulouse-Balma | Hard | R32 | 809 | 1907 | Sigsgaard d. (Q)Max Cunat [FRA] | 6-3 7-6(3) | | | | | | | | | |
13‑Feb‑2023 | M25 Vila Real de Santo Antonio | Hard | QF | 834 | 325 | (3)Pablo Llamas Ruiz [ESP] d. (Q)Sigsgaard | 4-6 6-2 6-2 | | | | | | | | | |
13‑Feb‑2023 | M25 Vila Real de Santo Antonio | Hard | R16 | 834 | 419 | (Q)Sigsgaard d. (8)Alberto Barroso Campos [ESP] | 6-0 6-3 | | | | | | | | | |
13‑Feb‑2023 | M25 Vila Real de Santo Antonio | Hard | R32 | 834 | 646 | (Q)Sigsgaard d. (WC)Pedro Araujo [POR] | 7-5 6-2 | | | | | | | | | |
16‑Jan‑2023 | M25 Manacor | Hard | R32 | 818 | 375 | (8)Sebastian Fanselow [GER] d. (Q)Sigsgaard | 6-3 7-5 | | | | | | | | | |