Markos Kalovelonis
Markos Kalovelonis is a Greek-Russian tennis player.
Kalovelonis has a career high ATP singles ranking of 607 achieved on 14 December 2015. He also has a career high ATP doubles ranking of 297 achieved on 2 November 2015. Kalovelonis has won 8 ITF doubles titles.
Kalovelonis has represented Greece at the Davis Cup where he has a W/L record of 6–5.
Kalovelonis is the son of former Greek tennis player, George Kalovelonis and Russian Karina Nazarenko. In 2014, Kalovelonis decided to represent Russia instead of Greece. In 2019, Kalovelonis switched back to represent Greece.
Futures and Challenger finals
Singles: 2 (0–2)
| Outcome | No. | Date | Tournament | Surface | Opponent | Score |
| Runner-up | 1. | Aktobe, Kazakhstan | Hard |  Sergey Betov | 3–6, 4–6 | |
| Runner-up | 2. | Namangan, Uzbekistan | Hard |  Chen Ti | 4–6, 2–6 |
Doubles: 23 (10–13)
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents | Score |
| Runner-up | 1. | Heraklion, Greece | Carpet |  Charalampos Kapogiannis |  Björn Propst Bastian Trinker | 1–6, 3–6 | |
| Winner | 2. | Sharm El Sheikh, Egypt | Clay |  Angelos Lenis |  Karim Hossam Karim-Mohamed Maamoun | 6–4, 3–6, | |
| Winner | 3. | Filippiada, Greece | Hard | Alexandros Jakupovic |  Valentin Dimov Dinko Halachev | 6–3, 6–3 | |
| Runner-up | 4. | Karshi, Uzbekistan | Hard |  Shonigmatjon Shofayziyev |  Piotr Gadomski Adam Majchrowicz | 5–7, 1–6 | |
| Winner | 5. | Istanbul, Turkey | Hard |  Alexander Merino |  Damian Farinola Darren Polkinghorne | 3–6, 6–1, | |
| Runner-up | 6. | Tehran, Iran | Clay |  Amirvala Madanchi |  Vinayak Sharma Kaza Vijay Sundar Prashanth | 3–6, 4–6 | |
| Runner-up | 7. | Heraklion, Greece | Hard | Alexandros Jakupovic |  Ivan Bjelica Miljan Zekić | 3–6, 6–7 | |
| Winner | 8. | Heraklion, Greece | Hard | Alexandros Jakupovic |  Sander Gillé Alexis Musialek | 7–6, 7–6 | |
| Runner-up | 9. | Heraklion, Greece | Hard | Alexandros Jakupovic | Danilo Petrović Ilija Vucic | 5–7, 2–6 | |
| Winner | 10. | Heraklion, Greece | Hard | Alexandros Jakupovic |  Patrich Grigoriu Costin Paval | 6–4, 6–2 | |
| Winner | 11. | Heraklion, Greece | Hard | Alexandros Jakupovic | Patrich Grigoriu Costin Paval | 2–6, 7–5, | |
| Runner-up | 12. | Sharm El Sheikh, Egypt | Hard | Lucas Miedler | Martin Fischer Jannis Liniger | 4–6, 2–6 | |
| Winner | 13. | Heraklion, Greece | Hard | Alexandros Jakupovic |  Joe Salisbury Joshua Ward-Hibbert | 6–1, 6–2 | |
| Runner-up | 14. | Bol, Croatia | Clay |  Martin Beran |  Gábor Borsos Levente Gödry | 4–6, 5–7 | |
| Runner-up | 15. | Andijan, Uzbekistan | Hard | Shonigmatjon Shofayziyev |  Denis Matsukevitch Denys Molchanov | 6–2, 6–7, | |
| Runner-up | 16. | Istanbul, Turkey | Hard | Temur Ismailov |  Tuna Altuna Bradley Mousley | 4–6, 4–6 | |
| Runner-up | 17. | Chennai, India | Hard |  Timur Khabibulin | Jeevan Nedunchezhiyan Vijay Sundar Prashanth | 6–4, 3–6, | |
| Runner-up | 18. | Chennai, India | Hard | Kunal Anand |  Xin Gao Bowen Ouyang | 2–6, 7–5, | |
| Runner-up | 19. | Shymkent, Kazakhstan | Clay | Aleksandar Lazov | Ivan Gakhov Aleksandre Metreveli | 6–7, 3–6 | |
| Winner | 20. | Lamaca, Cyprus | Hard | Konstantinos Economidis |  Andrés Artuñedo Martinavarro Steven Diez | 4–6, 6–3, | |
| Runner-up | 21. | Shymkent, Kazakhstan | Clay | Aleksandre Metreveli | Saniar Fayziev Andrei Vasilevski | 2–6, 4–6 | |
| Winner | 22. | Shymkent, Kazakhstan | Clay | Aleksandre Metreveli | Miki Janković Andrei Vasilevski | 6–4, 6–1 | |
| Winner | 23. | Andijan, Uzbekistan | Hard | Sriram Balaji | Roman Khassanov Vitaly Kozyukov | 6–3, 6–4 |