4‑Dec‑2023 | M15 Antalya | Clay | R16 | 900 | 504 | (5)Dmitry Popko [KAZ] d. Schiessl | 0-6 6-3 6-2 | | | | | | | | | |
4‑Dec‑2023 | M15 Antalya | Clay | R32 | 900 | | Schiessl d. (WC)Jan Jermar [CZE] | 6-2 6-4 | | | | | | | | | |
27‑Nov‑2023 | M15 Antalya | Clay | R16 | 894 | 1228 | (WC)Mert Alkaya [TUR] d. (8)Schiessl | 6-1 6-2 | | | | | | | | | |
27‑Nov‑2023 | M15 Antalya | Clay | R32 | 894 | 1845 | (8)Schiessl d. (Q)Oscar Galimardanov [RUS] | 6-7(5) 7-6(2) 7-5 | | | | | | | | | |
23‑Oct‑2023 | Curitiba CH | Clay | Q2 | 932 | 444 | (4)Mateus Alves [BRA] d. Schiessl | 7-6(5) 6-7(6) 6-2 | | 0.81 | 7.2% | 5.6% | 53.6% | 70.1% | 48.3% | 11/14 | 3:26 |
23‑Oct‑2023 | Curitiba CH | Clay | Q1 | 932 | 493 | Schiessl d. (8)Jose Pereira [BRA] | 6-4 3-1 RET | | 1.68 | 5.4% | 0.0% | 62.2% | 78.3% | 71.4% | 0/0 | 1:05 |
9‑Oct‑2023 | M25 Lajeado | Clay | R16 | 958 | 328 | (1)Eduardo Ribeiro [BRA] d. Schiessl | 6-2 6-3 | | | | | | | | | |
9‑Oct‑2023 | M25 Lajeado | Clay | R32 | 958 | 1040 | Schiessl d. Rafael Tosetto [BRA] | 6-3 4-6 6-4 | | | | | | | | | |
2‑Oct‑2023 | Campinas CH | Clay | Q1 | 958 | 573 | (8)Wilson Leite [BRA] d. (Alt)Schiessl | 6-3 2-6 6-4 | | 0.95 | 3.8% | 5.7% | 46.7% | 57.1% | 44.6% | 12/18 | 2:44 |
25‑Sep‑2023 | M25 Lujan | Clay | R32 | 956 | 404 | (3)Gonzalo Bueno [PER] d. (Q)Schiessl | 4-6 7-6(6) 6-3 | | | | | | | | | |
18‑Sep‑2023 | M15 Punta del Este | Clay | R32 | 951 | 656 | (4)Franco Roncadelli [URU] d. Schiessl | 3-6 6-3 6-0 | | | | | | | | | |
21‑Aug‑2023 | M15 Sao Paulo | Clay | QF | 993 | 332 | (1)Eduardo Ribeiro [BRA] d. Schiessl | 7-6(6) 6-4 | | | | | | | | | |
21‑Aug‑2023 | M15 Sao Paulo | Clay | R16 | 993 | 1471 | Schiessl d. (Q)Luis Britto [BRA] | 6-3 6-3 | | | | | | | | | |
21‑Aug‑2023 | M15 Sao Paulo | Clay | R32 | 993 | 873 | Schiessl d. (7)Joao Victor Couto Loureiro [BRA] | 6-1 6-4 | | | | | | | | | |
14‑Aug‑2023 | M15 Belem | Hard | QF | 994 | 823 | (4)Rodrigo Pacheco Mendez [MEX] d. (8)Schiessl | 6-2 6-3 | | | | | | | | | |
14‑Aug‑2023 | M15 Belem | Hard | R16 | 994 | 1292 | (8)Schiessl d. Joao Marcos Nusdeo [BRA] | 6-1 6-2 | | | | | | | | | |
14‑Aug‑2023 | M15 Belem | Hard | R32 | 994 | | (8)Schiessl d. (Q)Lucas Andrade Da Silva [BRA] | 6-4 6-4 | | | | | | | | | |
17‑Jul‑2023 | M25 EschAlzette | Clay | R32 | 998 | | (Q)Samuel Brosset [FRA] d. Schiessl | 6-7(5) 7-5 6-4 | | | | | | | | | |
3‑Jul‑2023 | M25 Biella | Clay | QF | 1077 | 390 | (3)Stefano Napolitano [ITA] d. (Q)Schiessl | 6-1 6-3 | | | | | | | | | |
3‑Jul‑2023 | M25 Biella | Clay | R16 | 1077 | 687 | (Q)Schiessl d. (8)Giorgio Tabacco [ITA] | 7-6(6) 7-6(3) | | | | | | | | | |
3‑Jul‑2023 | M25 Biella | Clay | R32 | 1077 | 1383 | (Q)Schiessl d. (Q)Ryusuke Horiuchi [JPN] | 6-0 6-3 | | | | | | | | | |
19‑Jun‑2023 | M15 Kursumlijska Banja | Clay | R32 | 1993 | 610 | (7)Hynek Barton [CZE] d. (SE)Schiessl | 6-2 7-5 | | | | | | | | | |
12‑Jun‑2023 | M15 Kursumlijska Banja | Clay | F | 1986 | 1034 | (Q)Viktor Jovic [SRB] d. (Q)Schiessl | 7-5 6-4 | | | | | | | | | |
12‑Jun‑2023 | M15 Kursumlijska Banja | Clay | SF | 1986 | 552 | (Q)Schiessl d. (3)Marat Sharipov [RUS] | 6-4 6-4 | | | | | | | | | |
12‑Jun‑2023 | M15 Kursumlijska Banja | Clay | QF | 1986 | 1062 | (Q)Schiessl d. Mwendwa Mbithi [USA] | 6-4 6-2 | | | | | | | | | |
12‑Jun‑2023 | M15 Kursumlijska Banja | Clay | R16 | 1986 | 1208 | (Q)Schiessl d. (Q)Gorazd Srbljak [MKD] | 7-5 6-7 10-8 | | | | | | | | | |
12‑Jun‑2023 | M15 Kursumlijska Banja | Clay | R32 | 1986 | 613 | (Q)Schiessl d. (7)Stefan Popovic [SRB] | 6-2 7-6(6) | | | | | | | | | |
29‑May‑2023 | M25 Kiseljak | Clay | R32 | 2023 | 409 | (4)Juan Bautista Otegui [ARG] d. (Q)Schiessl | 7-5 3-6 7-6(5) | | | | | | | | | |
24‑Apr‑2023 | M15 Mogi das Cruzes | Clay | R32 | 1988 | 1182 | Gabriel Roveri Sidney [BRA] d. (Q)Schiessl | 6-1 6-2 | | | | | | | | | |
17‑Apr‑2023 | Florianopolis CH | Clay | Q1 | 1982 | 488 | (5)Orlando Luz [BRA] d. (WC)Schiessl | 6-0 6-1 | | 0.40 | 4.3% | 2.1% | 63.8% | 50.0% | 23.5% | 1/6 | 0:58 |
20‑Mar‑2023 | M15 Antalya | Clay | R32 | 1967 | 604 | (7)Jorge Martinez Martinez [ESP] d. (WC)Schiessl | 6-2 3-6 6-2 | | | | | | | | | |