 Spain: Madrid - Singles - Main |
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| 1/64-finals | Nishioka Y. | Auger-Aliassime F. | 1:2 (6:4, 1:6, 4:6) | details | 25.04.2024 |
| Spain: Barcelona - Singles - Main |
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| 1/32-finals | Munar J. | Nishioka Y. | 2:0 (6:3, 6:1) | details | 16.04.2024 |
 USA: Miami - Singles - Main |
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| 1/64-finals | Nishioka Y. | Cobolli F. | 1:2 (6:1, 1:6, 4:6) | details | 20.03.2024 |
| USA: Miami - Singles - Qualification |
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| Final | Nishioka Y. | Nava E. | 0:2 (5:7, 66:7) | details | 19.03.2024 |
| Semi-finals | Nishioka Y. | Ymer E. | 2:0 (6:3, 7:64) | details | 18.03.2024 |
| USA: Indian Wells - Singles - Qualification |
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| Semi-finals | Nishioka Y. | Shang J. | 1:2 (6:4, 612:7, 3:6) | details | 05.03.2024 |
 Mexico: Acapulco - Singles - Main |
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| 1/8-finals | Nishioka Y. | Draper J. | 0:2 (3:6, 0:6) | details | 29.02.2024 |
| 1/16-finals | Borges N. | Nishioka Y. | 1:2 (6:3, 2:6, 4:6) | details | 27.02.2024 |
| Mexico: Acapulco - Singles - Qualification |
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| Final | Nishioka Y. | Mmoh M. | 1:2 (2:6, 6:1, 0:6) | details | 26.02.2024 |
| Semi-finals | Nishioka Y. | Rubio Fierros A. F. | 2:0 (6:2, 6:1) | details | 25.02.2024 |
| Mexico: Los Cabos - Singles - Main |
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| 1/8-finals | Zverev A. | Nishioka Y. | 2:0 (6:3, 6:0) | details | 22.02.2024 |
| 1/16-finals | Cobolli F. | Nishioka Y. | 0:2 (1:6, 0:6) | details | 21.02.2024 |
| USA: Delray Beach - Singles - Main |
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| 1/16-finals | Nishioka Y. | Arnaldi M. | 1:2 (6:4, 4:6, 3:6) | details | 12.02.2024 |
| USA: Dallas - Singles - Main |
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| 1/8-finals | Mannarino A. | Nishioka Y. | WO. | details | 09.02.2024 |
| 1/16-finals | Martinez P. | Nishioka Y. | CAN. | details | 06.02.2024 |
| 1/16-finals | Atmane T. | Nishioka Y. | 1:2 (65:7, 6:4, 3:6) | details | 06.02.2024 |
 World: Davis Cup - World Group I - Singles - Preliminary |
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| | Hassan B. | Nishioka Y. | 1:2 (6:1, 62:7, 4:6) | details | 03.02.2024 |
| | Habib H. | Nishioka Y. | 0:2 (3:6, 4:6) | details | 02.02.2024 |
 Australia: Australian Open - Singles - Main |
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| 1/64-finals | Rune H. | Nishioka Y. | 3:1 (6:2, 4:6, 7:63, 6:4) | details | 16.01.2024 |
| Australia: Adelaide - Singles - Main |
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| 1/16-finals | O'Connell C. | Nishioka Y. | CAN. | details | 09.01.2024 |
 France: Paris - Singles - Main |
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| 1/16-finals | Nishioka Y. | Rublev A. | 0:2 (4:6, 3:6) | details | 31.10.2023 |
| 1/32-finals | Thompson J. | Nishioka Y. | 1:2 (65:7, 6:4, 2:6) | details | 30.10.2023 |
| France: Paris - Singles - Qualification |
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| Final | Nishioka Y. | Watanuki Y. | 2:0 (6:4, 6:4) | details | 29.10.2023 |
| Semi-finals | Nishioka Y. | Droguet T. | 2:1 (3:6, 7:64, 6:2) | details | 28.10.2023 |
 Japan: Tokyo - Singles - Main |
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| 1/16-finals | Nishioka Y. | Giron M. | 1:2 (614:7, 6:4, 1:6) | details | 16.10.2023 |
 China: Shanghai - Singles - Main |
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| 1/32-finals | Ruud C. | Nishioka Y. | 2:0 (7:5, 6:0) | details | 06.10.2023 |
| 1/64-finals | Altmaier D. | Nishioka Y. | 1:2 (4:6, 6:3, 62:7) | details | 04.10.2023 |
| China: Beijing - Singles - Main |
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| 1/8-finals | Nishioka Y. | Sinner J. | 0:2 (2:6, 0:6) | details | 01.10.2023 |
| 1/16-finals | Shang J. | Nishioka Y. | 1:2 (7:5, 5:7, 1:6) | details | 29.09.2023 |
| China: Zhuhai - Singles - Main |
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| Final | Khachanov K. | Nishioka Y. | 2:0 (7:62, 6:1) | details | 26.09.2023 |
| Semi-finals | Nishioka Y. | Karatsev A. | 2:0 (6:4, 6:4) | details | 25.09.2023 |
| Quarter-finals | Nishioka Y. | Struff J-L. | 2:0 (6:4, 7:5) | details | 24.09.2023 |
| 1/8-finals | Nishioka Y. | Harris L. | 2:0 (7:64, 7:65) | details | 22.09.2023 |
| 1/16-finals | Nishioka Y. | Atmane T. | 2:1 (0:6, 6:4, 6:2) | details | 20.09.2023 |
| USA: US Open - Singles - Main |
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| 1/64-finals | Wawrinka S. | Nishioka Y. | 3:0 (7:65, 6:2, 6:4) | details | 29.08.2023 |
| USA: Cincinnati - Singles - Main |
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| 1/16-finals | Zverev A. | Nishioka Y. | 2:0 (7:5, 6:4) | details | 16.08.2023 |
| 1/32-finals | Barrere G. | Nishioka Y. | 0:2 (4:6, 5:7) | details | 13.08.2023 |
 Canada: Toronto - Singles - Main |
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| 1/32-finals | Musetti L. | Nishioka Y. | 2:0 (6:4, 6:1) | details | 07.08.2023 |
| USA: Washington - Singles - Main |
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| 1/16-finals | Ruusuvuori E. | Nishioka Y. | 2:1 (65:7, 6:4, 6:2) | details | 01.08.2023 |
| USA: Atlanta - Singles - Main |
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| 1/8-finals | Vukic A. | Nishioka Y. | 2:1 (4:6, 7:5, 7:63) | details | 26.07.2023 |
 United Kingdom: Wimbledon - Singles - Main |
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| 1/64-finals | Nishioka Y. | Galan D. E. | 0:3 (4:6, 3:6, 3:6) | details | 03.07.2023 |
| France: French Open - Singles - Main |
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| 1/8-finals | Etcheverry T. M. | Nishioka Y. | 3:0 (7:68, 6:0, 6:1) | details | 05.06.2023 |
| 1/16-finals | Nishioka Y. | Seyboth Wild T. | 3:2 (3:6, 7:68, 2:6, 6:4, 6:0) | details | 03.06.2023 |