Lisbon challenger · ATP
Lisbon challenger 2021
ChallengerClayLisbon, Portugal26 September – 3 October 2021Prize money: 44,820 EUR43 matchesAltitude: 54 mCourt: Medium
Champion Dmitry Popko · Final: 6-4 6-4
Final rounds
| Final | Dmitry Popko vs Andrea Pellegrino | 6-2 6-4 |
| Semifinal | Dmitry Popko vs Hugo Gaston | 6-3 6-4 |
| Semifinal | Andrea Pellegrino vs Andrej Martin | 7-6(5) 1-0 ret. |
| Quarterfinal | Hugo Gaston vs Cedrik-Marcel Stebe | 7-6(3) 4-3 ret. |
| Quarterfinal | Dmitry Popko vs Joao Domingues | 6-7(4) 7-5 6-0 |
| Quarterfinal | Andrea Pellegrino vs Frederico Ferreira Silva | 6-3 6-1 |
| Quarterfinal | Andrej Martin vs Nikola Milojevic | 6-4 6-4 |
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