# 2021 Mallorca Championships – Singles

Daniil Medvedev defeated Sam Querrey in the final, 6–4, 6–2, to win the singles tennis title at the 2021 Mallorca Championships. It was Medvedev's first career grass court final. Querrey was contesting for his first title in four years.
This was the inaugural edition of the tournament.

## Seeds

The top four seeds received a bye into the second round.
* Daniil Medvedev (champion)
* Dominic Thiem (second round, retired due to wrist injury)
* Roberto Bautista Agut (quarterfinals)
* Pablo Carreño Busta (semifinals)
* Casper Ruud (quarterfinals)
* Karen Khachanov (second round)
* Ugo Humbert (second round, withdrew due to food poisoning)
* Dušan Lajović (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1/WC | Daniil Medvedev | 3 | 6 | 6 | | | | |
| 4 | Pablo Carreño Busta | 6 | 3 | 2 | | | | |
| 4 | Pablo Carreño Busta | 6 | 3 | 2 | 1/WC | Daniil Medvedev | 6 | 6 |
| | | | | | | Sam Querrey | 4 | 2 |
| | Sam Querrey | 6 | 6 | | | Sam Querrey | 4 | 2 |
| | Adrian Mannarino | 4 | 3 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1/WC | D Medvedev | 6 | 6 | | | | | | | | | |
| | L Harris | 4 | 2 | | | C Moutet | 4 | 2 | | | | | | | | | |
| | C Moutet | 6 | 6 | | | | | | 1/WC | D Medvedev | 7 | 6 | | | | | |
| | J Munar | 6$^3$ | 5 | | | | | | 5 | C Ruud | 5 | 1 | | | | | |
| | T Sandgren | 7$^7$ | 7 | | | T Sandgren | 3 | 4 | | | | | | | | | |
| | G Simon | 4 | 6$^4$ | | 5 | C Ruud | 6 | 6 | | | | | | | | | |
| 5 | C Ruud | 6 | 7$^7$ | | | | | | | | | | 1/WC | D Medvedev | 3 | 6 | 6 |
| | | | | | | | | | | | | | 4 | P Carreño Busta | 6 | 3 | 2 |
| | | | | | 4 | P Carreño Busta | 6 | 6 | | | | | | | | | |
| | J Veselý | 7$^7$ | 6 | | | J Veselý | 4 | 4 | | | | | | | | | |
| | S Caruso | 6$^2$ | 2 | | | | | | 4 | P Carreño Busta | 6 | 6 | | | | | |
| | J Thompson | 2 | 7$^7$ | 6 | | | | | | J Thompson | 4 | 4 | | | | | |
| | P Andújar | 6 | 6$^4$ | 2 | | J Thompson | 6 | 6 | | | | | | | | | |
| Q | L Klein | 6 | 7$^7$ | | Q | L Klein | 4 | 4 | | | | | | | | | |
| 8 | D Lajović | 4 | 6$^2$ | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 7 | U Humbert | 4 | 7$^7$ | 6 | | | | | | | | | | | | | |
| | M Kecmanović | 6 | 6$^3$ | 2 | 7 | U Humbert | | | | | | | | | | | |
| Q | R Carballés Baena | 7 | 4 | 6$^3$ | | S Querrey | w/o | | | | | | | | | | |
| | S Querrey | 5 | 6 | 7$^7$ | | | | | | | S Querrey | 6 | 7$^7$ | | | | |
| | S Travaglia | 7 | 7$^7$ | | | | | | | 3/WC | R Bautista Agut | 3 | 6$^4$ | | | | |
| | G Pella | 5 | 6$^4$ | | | S Travaglia | 3 | 5 | | | | | | | | | |
| | | | | | 3/WC | R Bautista Agut | 6 | 7 | | | | | | | | | |
| | | | | | | | | | | | | | | | S Querrey | 6 | 6 |
| 6 | K Khachanov | 7$^9$ | 3 | 6 | | | | | | | | | | | A Mannarino | 4 | 3 |
| Q | L Pouille | 6$^7$ | 6 | 4 | 6 | K Khachanov | 6 | 2 | 4 | | | | | | | | |
| Q | N Kuhn | 1 | 6$^4$ | | | F López | 4 | 6 | 6 | | | | | | | | |
| | F López | 6 | 7$^7$ | | | | | | | | F López | 4 | 6 | 3 | | | |
| | J-L Struff | 6$^3$ | 3 | | | | | | | | A Mannarino | 6 | 3 | 6 | | | |
| | A Mannarino | 7$^7$ | 6 | | | A Mannarino | 2 | | | | | | | | | | |
| | | | | | 2/WC | D Thiem | 5$^r$ | | | | | | | | | | |

## Qualifying
### Seeds

* Pablo Cuevas (first round)
* Radu Albot (qualifying competition)
* Lucas Pouille (qualified)
* Roberto Carballés Baena (qualified)
* Pedro Martínez (first round)
* João Sousa (qualifying competition)
* Daniel Elahi Galán (first round)
* Denis Istomin (qualifying competition)

### Qualifiers

* Lukáš Klein
* Nicola Kuhn
* Lucas Pouille
* Roberto Carballés Baena

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Pablo Cuevas | 3 | 4 | | | | | | |
| | Lukáš Klein | 6 | 6 | | | | | | |
| | Lukáš Klein | 6 | 6 | | | Lukáš Klein | 6 | 2 | 6 |
| | | | | | 8 | Denis Istomin | 3 | 6 | 4 |
| | Roberto Ortega Olmedo | 6 | 5 | 6$^5$ | 8 | Denis Istomin | 3 | 6 | 4 |
| 8 | Denis Istomin | 4 | 7 | 7$^7$ | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Radu Albot | 6 | 4 | 7 | | | | |
| | Matthias Bachinger | 4 | 6 | 5 | | | | |
| | Matthias Bachinger | 4 | 6 | 5 | 2 | Radu Albot | 6$^5$ | 4 |
| | | | | | | Nicola Kuhn | 7$^7$ | 6 |
| | Nicola Kuhn | 6 | 6 | | | Nicola Kuhn | 7$^7$ | 6 |
| 5 | Pedro Martínez | 2 | 2 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Lucas Pouille | 5 | 6 | 6 | | | | |
| WC | Marc Othman Ktiri | 7 | 2 | 2 | | | | |
| WC | Marc Othman Ktiri | 7 | 2 | 2 | 3 | Lucas Pouille | 7$^{11}$ | 6 |
| | | | | | 6 | João Sousa | 6$^9$ | 4 |
| | Matteo Viola | 4 | 4 | | 6 | João Sousa | 6$^9$ | 4 |
| 6 | João Sousa | 6 | 6 | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Roberto Carballés Baena | 6 | 6 | | | | | | |
| WC | Daniel Rincón | 2 | 1 | | | | | | |
| WC | Daniel Rincón | 2 | 1 | | 4 | Roberto Carballés Baena | 6 | 5 | 6 |
| | | | | | | Yosuke Watanuki | 4 | 7 | 2 |
| | Yosuke Watanuki | 6 | 3 | 7 | | Yosuke Watanuki | 4 | 7 | 2 |
| 7 | Daniel Elahi Galán | 4 | 6 | 5 | | | | | |