US Open 
Jingshan 
Porto 
Singapore 
Seoul 
Adana 
Tulln 
Plovdiv 3 
Cassis 
Davis Сup Group I Tennis. Played Callejon Hernando Sergio. Season 2026
Country 
Spain. Ranking ATP 486.
Spain. Ranking ATP 486. | ||||
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| 14.09.2026 | First round | Pacheco Mendez Rodrigo — Callejon Hernando Sergio | 2:0 (6:3, 7:5) |
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| 08.09.2026 | First round | Callejon Hernando Sergio — Simakin Ilia | 1:2 (6:7, 6:2, 2:6) |
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| Manacor | ||||
| 01.09.2026 | Qialification final | Gueymard Wayenburg Sascha — Callejon Hernando Sergio | 2:0 (6:4, 6:1) |
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| 31.08.2026 | Qualifications - 1st round | Callejon Hernando Sergio — Durasovic Viktor | 2:0 (6:3, 6:4) |
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 ATP - | ||||
| 09.06.2026 | First round | Ferrari Gianmarco — Callejon Hernando Sergio | 2:0 (7:6, 6:0) |
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| 08.06.2026 | Qialification final | Ratti Lucio — Callejon Hernando Sergio | 1:2 (6:7, 6:3, 2:6) |
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| Vicenza | ||||
| 24.05.2026 | Qualifications - 1st round | Arnaboldi Federico — Callejon Hernando Sergio | 2:0 (6:3, 6:4) |
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| Menorca | ||||
| 03.04.2026 | Second round | Callejon Hernando Sergio — Paulson Andrew | 2:0 (6:2, 6:1) |
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| 03.04.2026 | Quarter-finals | Callejon Hernando Sergio — Rincon Daniel | 1:2 (6:3, 2:6, 5:7) |
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| 02.04.2026 | First round | Kolar Zdenek — Callejon Hernando Sergio | 1:2 (7:5, 6:7, 1:6) |
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| 01.04.2026 | Qialification final | Yevseyev Denis — Callejon Hernando Sergio | 0:2 (3:6, 1:6) |
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| Tenerife 2 | ||||
| 10.02.2026 | Qialification final | Callejon Hernando Sergio — Fomin Sergey | 2:0 (7:6, 6:1) |
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| 10.02.2026 | First round | Maestrelli Francesco — Callejon Hernando Sergio | 2:1 (4:6, 6:2, 6:4) |
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| 08.02.2026 | Qualifications - 1st round | Callejon Hernando Sergio — Fonio Giovanni | 2:0 (6:1, 6:0) |
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| Tenerife | ||||
| 03.02.2026 | First round | Callejon Hernando Sergio — Tiffon Pol Martin | 0:2 (3:6, 1:6) |
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