27‑Nov‑2023 | Maia CH | Clay | R32 | 656 | 107 | (4)Fabio Fognini [ITA] d. (Q)Gentzsch | 6-7(7) 6-3 7-5 | | 0.84 | 7.3% | 5.5% | 53.2% | 81.0% | 41.2% | 12/16 | 2:34 |
27‑Nov‑2023 | Maia CH | Clay | Q2 | 656 | 412 | (10)Gentzsch d. (3)Miguel Damas [ESP] | 2-6 6-3 6-1 | | 1.16 | 8.5% | 3.7% | 68.3% | 66.1% | 50.0% | 4/7 | 1:56 |
27‑Nov‑2023 | Maia CH | Clay | Q1 | 656 | 1159 | (10)Gentzsch d. Federico Bertuccioli [ITA] | 6-4 6-2 | | 1.16 | 4.0% | 12.0% | 44.0% | 60.6% | 42.9% | 3/7 | 1:29 |
13‑Nov‑2023 | M15 Monastir | Hard | R32 | 663 | 1066 | (Q)Nikola Basic [CRO] d. (8)Gentzsch | 4-6 6-1 6-3 | | | | | | | | | |
6‑Nov‑2023 | M15 Monastir | Hard | QF | 656 | 648 | (4)Juan Bautista Otegui [ARG] d. (5)Gentzsch | 6-3 6-4 | | | | | | | | | |
6‑Nov‑2023 | M15 Monastir | Hard | R16 | 656 | 1128 | (5)Gentzsch d. Nicolas Kobelt [SUI] | 7-5 6-1 | | | | | | | | | |
6‑Nov‑2023 | M15 Monastir | Hard | R32 | 656 | 1555 | (5)Gentzsch d. (Q)Mohamed Nazim Makhlouf [ALG] | 6-3 6-3 | | | | | | | | | |
30‑Oct‑2023 | Ismaning CH | Carpet | Q2 | 666 | 327 | (4)Andrew Paulson [CZE] d. (WC)Gentzsch | 3-6 7-6(5) 7-6(4) | | 1.14 | 18.3% | 5.5% | 63.3% | 84.1% | 52.5% | 5/5 | 2:12 |
30‑Oct‑2023 | Ismaning CH | Carpet | Q1 | 666 | 392 | (WC)Gentzsch d. (11)Elmar Ejupovic [GER] | 7-6(4) 7-6(3) | | 0.91 | 17.3% | 11.1% | 71.6% | 87.9% | 47.8% | 1/1 | 1:36 |
16‑Oct‑2023 | M15 Monastir | Hard | QF | 693 | 245 | (1)Aziz Dougaz [TUN] d. (8)Gentzsch | 6-1 6-4 | | | | | | | | | |
16‑Oct‑2023 | M15 Monastir | Hard | R16 | 693 | 824 | (8)Gentzsch d. Samir Hamza Reguig [ALG] | 6-2 6-4 | | | | | | | | | |
16‑Oct‑2023 | M15 Monastir | Hard | R32 | 693 | 925 | (8)Gentzsch d. Yuta Kikuchi [JPN] | 6-2 7-6(5) | | | | | | | | | |
9‑Oct‑2023 | M15 Monastir | Hard | SF | 721 | 737 | (7)Maxence Beauge [FRA] d. (6)Gentzsch | 7-6(5) 6-2 | | | | | | | | | |
9‑Oct‑2023 | M15 Monastir | Hard | QF | 721 | 642 | (6)Gentzsch d. (3)Adrien Gobat [FRA] | 6-2 6-4 | | | | | | | | | |
9‑Oct‑2023 | M15 Monastir | Hard | R16 | 721 | 769 | (6)Gentzsch d. Aziz Ouakaa [TUN] | 7-6(10) 2-6 7-5 | | | | | | | | | |
9‑Oct‑2023 | M15 Monastir | Hard | R32 | 721 | | (6)Gentzsch d. (WC)Josh Roe Flannelly [IRL] | 6-4 6-0 | | | | | | | | | |
2‑Oct‑2023 | M15 Bad Waltersdorf | Clay | R16 | 721 | 1277 | (Q)David Fix [GER] d. (7)Gentzsch | 6-3 6-2 | | | | | | | | | |
2‑Oct‑2023 | M15 Bad Waltersdorf | Clay | R32 | 721 | 1626 | (7)Gentzsch d. (Q)Nik Mikovic [SLO] | 6-3 6-1 | | | | | | | | | |
25‑Sep‑2023 | M15 Forbach | Carpet | SF | 714 | 844 | Hamish Stewart [GBR] d. (7)Gentzsch | 7-6(6) 7-6(4) | | | | | | | | | |
25‑Sep‑2023 | M15 Forbach | Carpet | QF | 714 | | (7)Gentzsch d. Volodymyr Iakubenko [UKR] | 6-7(4) 7-6(5) 7-6(3) | | | | | | | | | |
25‑Sep‑2023 | M15 Forbach | Carpet | R16 | 714 | 986 | (7)Gentzsch d. Boris Fassbender [FRA] | 7-6(5) 7-6(4) | | | | | | | | | |
25‑Sep‑2023 | M15 Forbach | Carpet | R32 | 714 | 846 | (7)Gentzsch d. Niklas Schell [GER] | 7-6(5) 7-6(4) | | | | | | | | | |
11‑Sep‑2023 | M15 Buschhausen | Clay | R16 | 722 | 1008 | (WC)Marc Majdandzic [GER] d. (4)Gentzsch | 3-6 6-4 6-4 | | | | | | | | | |
11‑Sep‑2023 | M15 Buschhausen | Clay | R32 | 722 | 702 | (4)Gentzsch d. (Q)Jakob Schnaitter [GER] | 6-4 4-6 6-3 | | | | | | | | | |
4‑Sep‑2023 | M15 Koszalin | Clay | QF | 677 | 921 | (7)Dominik Kellovsky [CZE] d. (2)Gentzsch | 6-2 5-7 6-4 | | | | | | | | | |
4‑Sep‑2023 | M15 Koszalin | Clay | R16 | 677 | | (2)Gentzsch d. (WC)Oskar Grzegorzewski [POL] | 6-3 7-5 | | | | | | | | | |
4‑Sep‑2023 | M15 Koszalin | Clay | R32 | 677 | | (2)Gentzsch d. (Q)Maciej Matuszczyk [POL] | 7-5 5-7 6-2 | | | | | | | | | |
28‑Aug‑2023 | M15 Allershausen | Clay | QF | 677 | 649 | (4)Christoph Negritu [GER] d. (5)Gentzsch | 6-2 7-6(5) | | | | | | | | | |
28‑Aug‑2023 | M15 Allershausen | Clay | R16 | 677 | 942 | (5)Gentzsch d. Maik Steiner [GER] | 7-6(5) 6-4 | | | | | | | | | |
28‑Aug‑2023 | M15 Allershausen | Clay | R32 | 677 | 1323 | (5)Gentzsch d. David Fix [GER] | 6-2 6-4 | | | | | | | | | |
21‑Aug‑2023 | M15 Trier | Clay | F | 676 | 603 | (2)Hazem Naw [SYR] d. (4)Gentzsch | 6-4 6-2 | | | | | | | | | |
21‑Aug‑2023 | M15 Trier | Clay | SF | 676 | | (4)Gentzsch d. (Q)Tom Schonenberg [GER] | 6-4 6-2 | | | | | | | | | |
21‑Aug‑2023 | M15 Trier | Clay | QF | 676 | 1128 | (4)Gentzsch d. Max Wiskandt [GER] | 7-6(4) 6-7(4) 6-4 | | | | | | | | | |
21‑Aug‑2023 | M15 Trier | Clay | R16 | 676 | 1925 | (4)Gentzsch d. (WC)Mika Lipp [GER] | 6-4 1-6 7-6(6) | | | | | | | | | |
21‑Aug‑2023 | M15 Trier | Clay | R32 | 676 | | (4)Gentzsch d. (Q)Torben Steinorth [GER] | 6-2 6-3 | | | | | | | | | |
14‑Aug‑2023 | M15 Ueberlingen | Clay | R32 | 670 | 890 | Fnu Nidunjianzan [CHN] d. (7)Gentzsch | 6-4 4-6 6-4 | | | | | | | | | |
7‑Aug‑2023 | Meerbusch CH | Clay | Q2 | 697 | 480 | Tibo Colson [BEL] d. Gentzsch | 6-1 6-4 | | 0.60 | 6.3% | 3.2% | 68.3% | 55.8% | 40.0% | 8/12 | 1:09 |
7‑Aug‑2023 | Meerbusch CH | Clay | Q1 | 697 | 633 | Gentzsch d. (10)Maxime Mora [FRA] | 5-7 6-4 6-1 | | 1.21 | 4.4% | 7.8% | 52.2% | 78.7% | 51.2% | 3/5 | 2:05 |
31‑Jul‑2023 | M15 Eindhoven | Clay | QF | 694 | 708 | (4)Sander Jong [NED] d. (5)Gentzsch | 1-6 6-2 6-3 | | | | | | | | | |
31‑Jul‑2023 | M15 Eindhoven | Clay | R16 | 694 | 779 | (5)Gentzsch d. Christian Sigsgaard [DEN] | 2-6 6-4 6-3 | | | | | | | | | |
31‑Jul‑2023 | M15 Eindhoven | Clay | R32 | 694 | 929 | (5)Gentzsch d. Maciej Rajski [POL] | 6-4 4-6 6-3 | | | | | | | | | |
24‑Jul‑2023 | M15 Metzinger | Clay | R32 | 689 | | (Q)Gian Luca Tanner [SUI] d. (6)Gentzsch | 6-2 6-4 | | | | | | | | | |
10‑Jul‑2023 | M25+H Kassel | Clay | R32 | 712 | 721 | Aldin Setkic [BIH] d. Gentzsch | 6-4 6-2 | | | | | | | | | |
3‑Jul‑2023 | M25 Marburg | Clay | R16 | 712 | 490 | (5)Alex Rybakov [USA] d. Gentzsch | 6-7(2) 6-3 6-2 | | | | | | | | | |
3‑Jul‑2023 | M25 Marburg | Clay | R32 | 712 | 740 | Gentzsch d. Svyatoslav Gulin [RUS] | 5-3 RET | | | | | | | | | |
26‑Jun‑2023 | M15 Kamen | Clay | SF | 713 | 610 | (Q)Hynek Barton [CZE] d. (8)Gentzsch | 7-6(4) 7-5 | | | | | | | | | |
26‑Jun‑2023 | M15 Kamen | Clay | QF | 713 | 1742 | (8)Gentzsch d. (WC)Mariano Dedura Palomero [GER] | 5-1 RET | | | | | | | | | |
26‑Jun‑2023 | M15 Kamen | Clay | R16 | 713 | | (8)Gentzsch d. Marc Majdandzic [GER] | 6-3 4-6 7-6(2) | | | | | | | | | |
26‑Jun‑2023 | M15 Kamen | Clay | R32 | 713 | 884 | (8)Gentzsch d. Illia Biloborodko [UKR] | 6-3 6-4 | | | | | | | | | |
19‑Jun‑2023 | M15 Saarlouis | Clay | R16 | 710 | 1168 | (Q)Jeffrey Von Der Schulenburg [SUI] d. Gentzsch | 6-4 6-3 | | | | | | | | | |
19‑Jun‑2023 | M15 Saarlouis | Clay | R32 | 710 | 1571 | Gentzsch d. (Q)Luca Staeheli [SUI] | 4-6 6-3 6-2 | | | | | | | | | |
12‑Jun‑2023 | M15 Monastir | Hard | R32 | 740 | | Gilbert Soares Klier Junior [BRA] d. Gentzsch | 6-3 6-4 | | | | | | | | | |
5‑Jun‑2023 | M15 Vaasa | Hard | SF | 765 | 368 | (1)Karl Friberg [SWE] d. (3)Gentzsch | 6-1 6-1 | | | | | | | | | |
5‑Jun‑2023 | M15 Vaasa | Hard | QF | 765 | 843 | (3)Gentzsch d. (6)Nicolas Kobelt [SUI] | 6-3 6-7(5) 6-1 | | | | | | | | | |
5‑Jun‑2023 | M15 Vaasa | Hard | R16 | 765 | 1548 | (3)Gentzsch d. (Q)Siim Troost [EST] | 6-3 6-3 | | | | | | | | | |
5‑Jun‑2023 | M15 Vaasa | Hard | R32 | 765 | 1147 | (3)Gentzsch d. Gabriele Moghini [SUI] | 7-6(0) 6-3 | | | | | | | | | |
29‑May‑2023 | M15 Constanta | Clay | R16 | 765 | 699 | (6)Elmer Moller [DEN] d. Gentzsch | 6-0 3-6 6-3 | | | | | | | | | |
29‑May‑2023 | M15 Constanta | Clay | R32 | 765 | | Gentzsch d. (WC)Filip Gabriel Bara [ROU] | 6-3 6-2 | | | | | | | | | |
22‑May‑2023 | M25 Most | Clay | R32 | 760 | 313 | (1)Timo Stodder [GER] d. (Q)Gentzsch | 6-2 6-2 | | | | | | | | | |
1‑May‑2023 | M15 Alaminos-Larnaca | Clay | R32 | 781 | 591 | (6)Sebastian Prechtel [GER] d. Gentzsch | 6-4 6-7(4) 6-1 | | | | | | | | | |
24‑Apr‑2023 | M15 Meerbusch | Clay | R32 | 781 | 753 | (Q)Florian Broska [GER] d. Gentzsch | 3-6 6-3 6-3 | | | | | | | | | |
17‑Apr‑2023 | M15 Telde | Clay | R16 | 777 | 1720 | Darwin Blanch [USA] d. Gentzsch | 6-2 5-1 RET | | | | | | | | | |
17‑Apr‑2023 | M15 Telde | Clay | R32 | 777 | 1421 | Gentzsch d. (WC)Tomas Curras Abasolo [ESP] | 3-6 7-5 7-5 | | | | | | | | | |
3‑Apr‑2023 | M15 Antalya | Clay | R32 | 776 | 1339 | (Q)John Sperle [GER] d. Gentzsch | 6-4 6-2 | | | | | | | | | |
27‑Mar‑2023 | M25 Saint Dizier | Hard | R16 | 801 | 461 | (3)Khumoyun Sultanov [UZB] d. Gentzsch | 6-4 6-1 | | | | | | | | | |
27‑Mar‑2023 | M25 Saint Dizier | Hard | R32 | 801 | | Gentzsch d. (WC)Oscar Lacides [GUD] | 6-3 7-5 | | | | | | | | | |
20‑Mar‑2023 | M15 Antalya | Clay | QF | 801 | 974 | Gilles Arnaud Bailly [BEL] d. Gentzsch | 7-5 6-2 | | | | | | | | | |
20‑Mar‑2023 | M15 Antalya | Clay | R16 | 801 | 695 | Gentzsch d. Adam Moundir [MAR] | 3-6 6-3 6-2 | | | | | | | | | |
20‑Mar‑2023 | M15 Antalya | Clay | R32 | 801 | 547 | Gentzsch d. (3)Stefan Palosi [ROU] | 6-0 6-2 | | | | | | | | | |
13‑Mar‑2023 | M15 Antalya | Clay | R16 | 799 | 408 | (4)Andrey Chepelev [RUS] d. Gentzsch | 6-4 2-6 6-4 | | | | | | | | | |
13‑Mar‑2023 | M15 Antalya | Clay | R32 | 799 | 995 | Gentzsch d. (Q)Igor Gimenez [BRA] | 2-6 7-6(2) 6-3 | | | | | | | | | |
6‑Mar‑2023 | M15 Antalya | Clay | R32 | 799 | 558 | (2)Stefan Palosi [ROU] d. Gentzsch | 6-1 6-3 | | | | | | | | | |
20‑Feb‑2023 | M15 Antalya | Clay | R32 | 804 | 622 | (Q)Rrezart Cungu [MNE] d. Gentzsch | 6-4 6-1 | | | | | | | | | |
13‑Feb‑2023 | M15 Oberhaching | Hard | R16 | 801 | 326 | (2)Rudolf Molleker [GER] d. (WC)Gentzsch | 6-4 4-6 6-2 | | | | | | | | | |
13‑Feb‑2023 | M15 Oberhaching | Hard | R32 | 801 | 577 | (WC)Gentzsch d. Mirko Martinez [SUI] | 6-3 6-3 | | | | | | | | | |
30‑Jan‑2023 | Koblenz CH | Hard | Q1 | 799 | 335 | (1)Denis Yevseyev [KAZ] d. (WC)Gentzsch | 6-1 6-4 | | 0.73 | 5.0% | 10.0% | 51.7% | 58.1% | 37.9% | 8/12 | 1:15 |
23‑Jan‑2023 | M25 Nussloch | Carpet | R32 | 806 | 555 | Tristan Lamasine [FRA] d. (WC)Gentzsch | 4-6 6-3 6-1 | | | | | | | | | |
16‑Jan‑2023 | M15 Bressuire | Hard | R32 | 806 | 1178 | (WC)Adrien Gobat [FRA] d. Gentzsch | 6-1 6-4 | | | | | | | | | |
9‑Jan‑2023 | M15 Antalya | Clay | QF | 798 | 344 | (1)Dragos Nicolae Madaras [ROU] d. Gentzsch | 6-2 7-6(4) | | | | | | | | | |
9‑Jan‑2023 | M15 Antalya | Clay | R16 | 798 | 672 | Gentzsch d. (8)Davide Galoppini [ITA] | 6-3 6-4 | | | | | | | | | |
9‑Jan‑2023 | M15 Antalya | Clay | R32 | 798 | 728 | Gentzsch d. Lorenzo Bocchi [ITA] | 7-5 6-2 | | | | | | | | | |