 Spain: Madrid - Singles - Main |
|---|
| 1/64-finals | O'Connell C. | Arnaldi M. | 0:2 (4:6, 1:6) | details | 25.04.2024 |
 Germany: Munich - Singles - Main |
|---|
| 1/16-finals | Daniel T. | O'Connell C. | 2:0 (6:3, 6:4) | details | 16.04.2024 |
 Monaco: Monte Carlo - Singles - Main |
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| 1/32-finals | Tabilo A. | O'Connell C. | 2:0 (6:3, 6:4) | details | 08.04.2024 |
| Monaco: Monte Carlo - Singles - Qualification |
|---|
| Final | O'Connell C. | Vukic A. | 2:1 (6:2, 3:6, 7:65) | details | 07.04.2024 |
| Semi-finals | O'Connell C. | Marterer M. | 2:1 (7:5, 3:6, 6:3) | details | 06.04.2024 |
 USA: Miami - Singles - Main |
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| 1/8-finals | O'Connell C. | Sinner J. | 0:2 (4:6, 3:6) | details | 26.03.2024 |
| 1/16-finals | Damm M. | O'Connell C. | 0:2 (65:7, 65:7) | details | 24.03.2024 |
| 1/32-finals | O'Connell C. | Tiafoe F. | 2:0 (7:5, 7:65) | details | 23.03.2024 |
| 1/64-finals | O'Connell C. | Kopriva V. | 2:0 (6:2, 6:4) | details | 20.03.2024 |
| USA: Indian Wells - Singles - Main |
|---|
| 1/32-finals | Zverev A. | O'Connell C. | 2:0 (6:4, 6:4) | details | 08.03.2024 |
| 1/64-finals | O'Connell C. | Draper J. | 2:1 (1:6, 6:3, 6:2) | details | 06.03.2024 |
 United Arab Emirates: Dubai - Singles - Main |
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| 1/8-finals | Hurkacz H. | O'Connell C. | 2:0 (7:65, 6:4) | details | 28.02.2024 |
| 1/16-finals | Marterer M. | O'Connell C. | 0:2 (2:6, 4:6) | details | 27.02.2024 |
 Qatar: Doha - Singles - Main |
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| 1/8-finals | O'Connell C. | Ruusuvuori E. | 0:2 (3:6, 3:6) | details | 21.02.2024 |
| 1/16-finals | Struff J-L. | O'Connell C. | 0:2 (4:6, 4:6) | details | 20.02.2024 |
 Bahrain: Manama - Singles - Main |
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| 1/16-finals | O'Connell C. | Harris B. | 0:1 RET. (66:7) | details | 13.02.2024 |
 Australia: Australian Open - Singles - Main |
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| 1/32-finals | O'Connell C. | Shelton B. | 1:3 (4:6, 1:6, 6:3, 65:7) | details | 17.01.2024 |
| 1/64-finals | O'Connell C. | Garin C. | 3:2 (3:6, 7:5, 4:6, 6:1, 7:5) | details | 14.01.2024 |
| Australia: Adelaide - Singles - Main |
|---|
| Quarter-finals | O'Connell C. | Korda S. | 0:2 (4:6, 4:6) | details | 11.01.2024 |
| 1/8-finals | Shevchenko A. | O'Connell C. | 0:2 (3:6, 1:6) | details | 10.01.2024 |
| 1/16-finals | O'Connell C. | Rinderknech A. | 2:0 (6:4, 6:4) | details | 09.01.2024 |
| 1/16-finals | O'Connell C. | Nishioka Y. | CAN. | details | 09.01.2024 |
| Australia: Brisbane - Singles - Main |
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| 1/16-finals | Popyrin A. | O'Connell C. | 2:1 (6:4, 65:7, 7:64) | details | 31.12.2023 |
 Bulgaria: Sofia - Singles - Main |
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| 1/8-finals | Ofner S. | O'Connell C. | 2:1 (66:7, 6:4, 6:2) | details | 08.11.2023 |
| 1/16-finals | Medjedovic H. | O'Connell C. | 1:2 (7:63, 1:6, 62:7) | details | 07.11.2023 |
 France: Paris - Singles - Qualification |
|---|
| Final | Thiem D. | O'Connell C. | 2:0 (6:4, 6:3) | details | 29.10.2023 |
| Semi-finals | Rinderknech A. | O'Connell C. | 1:2 (6:4, 65:7, 3:6) | details | 28.10.2023 |
 Switzerland: Basel - Singles - Main |
|---|
| 1/16-finals | O'Connell C. | Baez S. | 1:2 (7:63, 4:6, 3:6) | details | 23.10.2023 |
| Switzerland: Basel - Singles - Qualification |
|---|
| Final | O'Connell C. | Seyboth Wild T. | 2:0 (7:64, 7:64) | details | 22.10.2023 |
| Semi-finals | O'Connell C. | Cressy M. | 2:0 (7:63, 7:5) | details | 21.10.2023 |
 Japan: Tokyo - Singles - Main |
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| 1/16-finals | Ofner S. | O'Connell C. | 2:1 (62:7, 7:65, 7:5) | details | 16.10.2023 |
 China: Shanghai - Singles - Main |
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| 1/64-finals | Van De Zandschulp B. | O'Connell C. | 2:1 (6:2, 62:7, 6:4) | details | 05.10.2023 |
| China: Chengdu - Singles - Main |
|---|
| Quarter-finals | Dimitrov G. | O'Connell C. | 2:0 (6:4, 6:1) | details | 24.09.2023 |
| 1/8-finals | O'Connell C. | Daniel T. | 2:0 (7:610, 6:4) | details | 22.09.2023 |
| 1/16-finals | O'Connell C. | Kachmazov A. | 2:0 (7:63, 6:4) | details | 21.09.2023 |
| China: Guangzhou - Singles - Main |
|---|
| Quarter-finals | O'Connell C. | Atmane T. | 0:2 (5:7, 3:6) | details | 14.09.2023 |
| 1/8-finals | O'Connell C. | Kadhe A. | 2:0 (6:4, 6:2) | details | 13.09.2023 |
| 1/16-finals | O'Connell C. | Palan D. | 2:0 (7:66, 6:2) | details | 12.09.2023 |
| China: Shanghai - Singles - Main |
|---|
| Final | O'Connell C. | Watanuki Y. | 2:0 (6:3, 7:5) | details | 10.09.2023 |
| Semi-finals | O'Connell C. | Tu L. | 2:0 (6:2, 6:4) | details | 09.09.2023 |
| Quarter-finals | O'Connell C. | Bai Y. | 2:0 (6:0, 6:2) | details | 08.09.2023 |
| 1/8-finals | O'Connell C. | Uchiyama Y. | 1:0 RET. (7:63, 4:1) | details | 07.09.2023 |
| 1/16-finals | O'Connell C. | Saville L. | 2:0 (6:4, 6:0) | details | 05.09.2023 |
| USA: US Open - Singles - Main |
|---|
| 1/32-finals | Medvedev D. | O'Connell C. | 3:1 (6:2, 6:2, 66:7, 6:2) | details | 01.09.2023 |
| 1/64-finals | Purcell M. | O'Connell C. | 1:3 (4:6, 3:6, 6:3, 65:7) | details | 29.08.2023 |