 World: Davis Cup - World Group II - Doubles - Main |
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| | Mansouri S./Ouakaa A. | Agwi M./Gannon C. | 2:0 (7:64, 6:3) | dettagli | 14.09.2024 |
 Ireland: M15 Dublin - Doubles - Main |
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| Semi-finals | Barry C./Gannon C. | Jones A./Pieczonka F. | 1:2 (4:6, 6:3, 7:10) | dettagli | 09.08.2024 |
| Quarter-finals | Barry C./Gannon C. | Calzi R./Cooper S. | 2:0 (7:65, 6:0) | dettagli | 08.08.2024 |
| 1/8-finals | Barry C./Gannon C. | Ambarzumjan E./Sibille I. | 2:0 (6:2, 6:0) | dettagli | 06.08.2024 |
 United Kingdom: M25 Nottingham 4 - Doubles - Main |
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| 1/8-finals | Gannon C./Lumsden E. | Davis J./Summers M. | 1:2 (7:5, 1:6, 6:10) | dettagli | 16.07.2024 |
 Croatia: M15 Bol 2 - Doubles - Main |
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| Quarter-finals | Gannon C./O'Hare D. | Jakic M./Markovina D. | WO. | dettagli | 30.05.2024 |
| 1/8-finals | Gannon C./O'Hare D. | Fekete J./Lehmann N. | 2:0 (6:3, 6:3) | dettagli | 29.05.2024 |
| World: Davis Cup - World Group I - Doubles - Preliminary |
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| | Gannon C./O'Hare D. | Erler A./Miedler L. | 0:2 (1:6, 65:7) | dettagli | 04.02.2024 |
| World: Davis Cup - World Group II - Doubles - Main |
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| | Arevalo M./Miralles L. | Gannon C./O'Hare D. | 0:2 (2:6, 3:6) | dettagli | 17.09.2023 |
| World: Davis Cup - World Group II - Doubles - Main |
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| | King D./Lewis H. | Gannon C./O'Hoisin O. | CAN. | dettagli | 17.09.2022 |
 USA: M15 Memphis, TN - Doubles - Main |
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| 1/8-finals | Snezhko N./Trondson J. | Gannon C./Stevenson D. | 2:1 (6:3, 4:6, 10:6) | dettagli | 16.08.2022 |
Morocco: M15 Casablanca - Singles - Main