WTA and ATP rankings on - 27.12.2021
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- Ranking - singles
- Ranking - doubles
- Race - singles
| Rank | Move | Player name | Country | Points |
| 131. | - |
Tsitsipas Stefanos | Greece | 800 |
| 218. | - |
Tsitsipas Petros | Greece | 388 |
| 303. | - |
Kalovelonis Markos | Greece | 221 |
| 313. | - |
Pervolarakis Michail | Greece | 214 |
| 894. | 1 |
Thanos Aristotelis | Greece | 35 |
| 1089. | 8 |
Skorilas Alexandros | Greece | 24 |
| 1373. | 56 |
Sakellaridis Stefanos | Greece | 13 |
| 1497. | 61 |
Sakellaridis Michalis | Greece | 10 |
| 1593. | 3 |
Xilas Ioannis | Greece | 8 |
| 1761. | 2 |
Kountourakis Ioannis | Greece | 6 |
| 1875. | 3 |
Theodorou Eleftherios | Greece | 4 |
| 1875. | 3 |
Tsitsipas Pavlos | Greece | 4 |
| 2174. | 8 |
Stergiou Ioannis | Greece | 3 |
| 2288. | 9 |
Sakellaridis Dimitris | Greece | 2 |
| 2502. | 9 |
Schinas Stephanos | Greece | 2 |
|1-50|
- Betting ranking
| Cerundolo Juan Manuel | +1525 |
| Guerrieri Andrea | +1130 |
| Gallego Juan Ignacio | +1119 |
| Dencheva Rositsa | +1088 |
| Encheva Lidia | +1080 |
| Svatikova Laura | -1434 |
| Covato Matteo | -1422 |
| Michalik Radovan | -1403 |
| Marcinkevica Diana | -1391 |
| Uchida Kaichi | -1366 |
This week's tournaments
| Main tournaments | ||||
| Davis Cup | 19 | |||
| Guadalajara 2 WTA | 6 | |||
| Sao Paulo WTA | 14 | |||
| Lower level tournaments | ||||
| Tiburon challenger | 10 | |||
| Szczecin challenger | 9 | |||
| Guangzhou 2 challenger | 6 | |||
| Rennes challenger | 8 | |||
| Phan Thiet 4 challenger | 6 | |||
| Biella challenger | 8 | |||
| UTR Pro Tennis Series | 42 | |||
| UTR Pro Tennis Series 3 | 88 | |||
| UTR Pro Tennis Series 5 | 39 | |||
| Caldas da Rainha | 9 | |||
| Ljubljana WTA | 7 | |||
| Valencia WTA | 7 | |||
| Le Neubourg ITF | 9 | |||
| Pazardzhik ITF | 3 | |||
| Hurghada 11 ITF | 7 | |||
| Kyoto ITF | 6 | |||
| Shenyang ITF | 5 | |||
| Santa Margherita Di Pula 11 ITF | 6 | |||
| UTR Pro Tennis Series 5 | 30 | |||
| Monastir 50 ITF | 7 | |||
| Sao Luis do Maranhao ITF | 12 | |||
| UTR Pro Match Series | 81 | |||
| UTR Pro Tennis Series | 58 | |||
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