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Billy Harris vs. Aristotelis Thanos - head to head matches
| 11.11.20 | q 2 | Aristotelis Thanos | Billy Harris | 7-62, 6-4 | match details |  M15 Heraklion | Hard |
Billy Harris form & Aristotelis Thanos form
Billy Harris - last matches
 Paris - Clay | ||||
| 20.05.25 q 1 | vs. Daniel Evans | 5-7, 3-6 |  | match details |
| Bordeaux Challenger - Clay | ||||
| 15.05.25 2nd round | vs. Tallon Griekspoor | 3-6, 4-6 | | match details |
| 13.05.25 1st round | vs. Stan Wawrinka | 3-6, 6-2, 6-1 |  | match details |
 Rome - Clay | ||||
| 05.05.25 q 1 | vs. Tomas Barrios Vera | 2-6, 4-6 | | match details |
| Aix En - Clay | ||||
| 29.04.25 1st round | vs. Daniel Elahi Galan | 2-6, 2-6 | | match details |
 Madrid - Clay | ||||
| 21.04.25 q 1 | vs. Ethan Quinn | 3-6, 4-6 | | match details |
 Munich - Clay | ||||
| 14.04.25 1st round | vs. David Goffin | 2-6, 7-62, 4-6 | | match details |
| 13.04.25 qual. | vs. Chun Hsin Tseng | 6-4, 6-75, 2-6 | | match details |
| 12.04.25 q 1 | vs. Aleksandar Vukic | 3-6, 6-3, 6-4 | | match details |
| Madrid Challenger - Clay | ||||
| 08.04.25 1st round | vs. Sebastian Ofner | 6-4, 3-6, 5-7 | | match details |
| Menorca Challenger - Clay | ||||
| 01.04.25 1st round | vs. Albert Ramos-Vinolas | 2-6, 6-4, 4-6 | | match details |
 Miami - Hard | ||||
| 19.03.25 1st round | vs. Eliot Spizzirri | 6-72, 6-3, 2-6 | | match details |
| 18.03.25 qual. | vs. Hugo Gaston | 7-5, 6-2 | | match details |
| 17.03.25 q 1 | vs. Mikael Ymer | 6-76, 7-65, 6-3 | | match details |
 Cap Cana - Hard | ||||
| 11.03.25 1st round | vs. Chak Lam Coleman Wong | 3-6, 7-64, 4-6 | | match details |
| Indian Wells - Hard | ||||
| 03.03.25 q 1 | vs. Michael Mmoh | 3-6, 2-6 | | match details |
 Bengaluru Challenger - Hard | ||||
| 01.03.25 1/2 | vs. Brandon Holt | 2-6, 6-74 | | match details |
| 28.02.25 1/4 | vs. Tristan Schoolkate | 6-2, 1-6, 7-5 | | match details |
| 26.02.25 2nd round | vs. Marek Gengel | 6-4, 6-3 | | match details |
| 25.02.25 1st round | vs. Enzo Couacaud | 6-1, 1-0, Enzo Couacaud - retired | | match details |
| 24.02.25 qual. | vs. Petr Bar Biryukov | 6-74, 4-6 | | match details |
| 23.02.25 q 1 | vs. Siddharth Vishwakarma | 6-2, 6-1 | | match details |
| Pune Challenger - Hard | ||||
| 21.02.25 1/4 | vs. Brandon Holt | 6-4, 3-6, 4-6 | | match details |
| 20.02.25 2nd round | vs. Hiroki Moriya | 7-5, 6-3 | | match details |
| 18.02.25 1st round | vs. Manas Manoj Dhamne | 6-4, 6-4 | | match details |
| New Delhi - Hard | ||||
| 16.02.25 fin | vs. Kyrian Jacquet | 4-6, 2-6 | | match details |
| 15.02.25 1/2 | vs. Tristan Schoolkate | 4-6, 7-64, 6-2 | | match details |
| 14.02.25 1/4 | vs. Elias Ymer | 6-2, 4-6, 7-61 | | match details |
| 13.02.25 2nd round | vs. James McCabe | 7-62, 6-3 | | match details |
| 11.02.25 1st round | vs. Eric Vanshelboim | 6-1, 6-4 | | match details |
Aristotelis Thanos - last matches
| M15 Heraklion - Hard | ||||
| 21.05.25 1st round | vs. Antoine Ghibaudo | 3-6, 4-6 | | match details |
| Davis Cup - Clay | ||||
| 02.02.25 | vs. Amr Elsayed | 6-0, 6-3 | | match details |
| M25 Columbus - I. hard | ||||
| 17.11.24 fin | vs. Aidan Kim | 5-7, 1-6 | | match details |
| 16.11.24 1/2 | vs. Derek Pham | 6-4, 7-5 | | match details |
| 15.11.24 1/4 | vs. Jack Anthrop | 6-2, 6-2 | | match details |
| 14.11.24 2nd round | vs. Mitchell Sheldon | 6-4, 6-1 | | match details |
| 12.11.24 1st round | vs. Chad Kissell | 6-3, 6-2 | | match details |
| M15 Ann - Hard | ||||
| 05.10.24 1/2 | vs. Alfredo Perez | 3-6, 6-3, 5-7 | | match details |
| 04.10.24 1/4 | vs. Dan Martin | 6-1, 6-3 | | match details |
| 03.10.24 2nd round | vs. Benjamin Thomas George | 6-4, 6-4 | | match details |
| 01.10.24 1st round | vs. William Cooksey | 6-3, 6-0 | | match details |
 Davis Cup - I. hard | ||||
| 14.09.24 Rubber 1 | vs. Miomir Kecmanovic | 3-6, 3-6 | | match details |
 M15 Budapest - Hard | ||||
| 06.09.24 1/4 | vs. Adam Jilly | 3-6, 0-3, - Aristotelis Thanos - retired | | match details |
| 05.09.24 2nd round | vs. Boris Butulija | 6-2, 6-4 | | match details |
| 04.09.24 1st round | vs. Stefan Cooper | 6-2, 7-62 | | match details |
| M15 Kursumlijska - Clay | ||||
| 11.08.24 fin | vs. Tommaso Compagnucci | 7-65, 6-2 | | match details |
| 10.08.24 1/2 | vs. Peter Fajta | 6-4, 1-0, Peter Fajta - retired | | match details |
| 09.08.24 1/4 | vs. Juan Cruz Martin Manzano | 6-4, 6-1 | | match details |
| 08.08.24 2nd round | vs. Christian Lerby | 6-3, 6-74, 7-5 | | match details |
| 07.08.24 1st round | vs. Hayato Matsuoka | 6-3, 6-0 | | match details |
| M15 Kursumlijska - Clay | ||||
| 04.08.24 fin | vs. Juan Manuel La Serna | 2-6, 4-6 | | match details |
| 03.08.24 1/2 | vs. Amaury Raynel | 6-4, 6-1 | | match details |
| 02.08.24 1/4 | vs. Lambert Ruland | 6-3, 6-4 | | match details |
| 01.08.24 2nd round | vs. Ioannis Xilas | 5-7, 7-5, 3-0, Ioannis Xilas - retired | | match details |
| 31.07.24 1st round | vs. Gianluca Filoramo | 6-2, 6-2 | | match details |
| M15 Kursumlijska - Clay | ||||
| 25.07.24 2nd round | vs. Andrej Nedic | 6-77, 5-7 | | match details |
| 24.07.24 1st round | vs. Abel Forger | 6-3, 1-6, 6-2 | | match details |
 M15 Umag - Clay | ||||
| 09.07.24 1st round | vs. Seydina Andre | 3-6, 4-6 | | match details |
| M15 Santo - Hard | ||||
| 07.06.24 2nd round | vs. Oliver Anderson | 3-6, 4-6 | | match details |
| 06.06.24 1st round | vs. Dan Martin | 6-2, 4-6, 10-8 | | match details |