| Lille Challenger 125 | 02/15/26 |
| Metepec Challenger 75 | 02/15/26 |
| Dubai ATP 500 | 02/15/26 |
| Acapulco ATP 500 | 02/15/26 |
| Santiago ATP 250 | 02/15/26 |
| Rio de Janeiro ATP 500 | 02/16/26 |
| Doha ATP 500 | 02/16/26 |
| Delray Beach ATP 250 | 02/16/26 |
| NEWS IMPORTANTI | 11/30/26 |
| Category | ATP Challenger Tour 100000$ |
| Name | Oeiras Challenger 100 |
| Drawsize | 32 |
| Round number | 5 |
| On date | 01/19/26 00:00 |
| Registration date | 01/13/26 00:00 |
| End registration date | 01/17/26 18:00 |
| Phase | Registration closed. |
| R32 | R16 | Quarter Finals |
Semi Finals |
Final |
|---|---|---|---|---|
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| Tourn Points | Provisional Entry List | Official Entry List | Round 32 | Round 16 | Quarter-finals | Semi-finals | Finals |