Ireland
13.03.04, 21 years
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USA
01.05.00, 25 years
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Arthur O'Sullivan vs. Henry Lieberman - head to head matches
Arthur O'Sullivan form & Henry Lieberman form
Arthur O'Sullivan - last matches
 M15 Santo - Hard |
| 20.11.24 1st round | vs. Maikel De Boes | 6-3, 2-6, 5-7 |  | match details |
| 19.11.24 qual. | vs. Francisco Montana | 6-0, 6-2 |  | match details |
| 18.11.24 q 2 | vs. Gianrocco De Filippo | 7-611, 6-3 | | match details |
| 17.11.24 q 1 | vs. Henry Lieberman | 6-3, 3-6, 10-3 | | match details |
 M15 Dublin - Carpet |
| 04.08.24 q 1 | vs. Gabriele Volpi | 6-70, 3-6 | | match details |
| 04.08.24 q 1 | vs. Gabriele Volpi | 6-70, 3-6 | | match details |
 M15 Monastir - Hard |
| 10.06.24 q 2 | vs. Mattia Ricci | 6-1, 6-2 | | match details |
| 10.06.24 qual. | vs. Robin Boeckli | 3-6, 4-6 | | match details |
| 09.06.24 q 1 | vs. Patrick Yeh Hsiang Wong | 3-2, Patrick Yeh Hsiang Wong - retired | | match details |
Henry Lieberman - last matches
 M25 Calabasas - Hard |
| 24.03.25 q 1 | vs. Aleksa Pisaric | 3-6, 3-6 | | match details |
 M15 Montreal - I. hard |
| 11.03.25 qual. | vs. Ronald Hohmann | 2-6, - Henry Lieberman - retired | | match details |
| 10.03.25 q 1 | vs. Jared Horwood | 6-4, 6-2 | | match details |
| M15 Sherbrooke - I. hard |
| 04.03.25 qual. | vs. Reece Falck | 7-5, 4-6, 7-10 | | match details |
| 03.03.25 q 1 | vs. Daniel Vishnick | 6-3, 6-0 | | match details |
| M15 Naples - Clay |
| 19.02.25 1st round | vs. Enzo Kohlmann De Freitas | 1-6, 0-6 | | match details |
| 18.02.25 qual. | vs. Keshav Chopra | 2-6, 6-4, 10-5 | | match details |
| 17.02.25 q 1 | vs. Lefteri Apostolou | 6-4, 6-4 | | match details |
| M15 Palm - Clay |
| 28.01.25 qual. | vs. Alex Jones | 2-6, 6-2, 7-10 | | match details |
| 27.01.25 q 1 | vs. Drew Van Orderlain | 7-60, 6-3 | | match details |
| M15 Santo - Hard |
| 25.11.24 q 1 | vs. Alp Horoz | 6-76, 5-7 | | match details |
| M15 Santo - Hard |
| 17.11.24 q 1 | vs. Arthur O'Sullivan | 3-6, 6-3, 3-10 | | match details |
 M15 Guatemala - Hard |
| 13.11.24 1st round | vs. Paulo Saraiva Dos Santos | 1-6, 3-6 | | match details |
| 11.11.24 qual. | vs. Gil Brahier | 7-62, 6-4 | | match details |
| 10.11.24 q 1 | vs. Jorge Miguel De La Vega | 6-3, 6-1 | | match details |
| M15 Guatemala - Hard |
| 03.11.24 q 1 | vs. Nicolas Esteban Rico Arias | 4-6, 6-74 | | match details |
| M15 Winston - Hard |
| 14.10.24 q 1 | vs. Viktor Markov | 6-4, 1-6, 13-15 | | match details |
| M25 Edmonton - I. hard |
| 07.10.24 qual. | vs. Andres Valentin Ispas | 6-4, 2-6, 4-10 | | match details |
| 06.10.24 q 1 | vs. Collin Hyte | 6-0, 6-0 | | match details |
| M15 Ann - Hard |
| 30.09.24 q 1 | vs. Chad Kissell | 6-72, 3-6 | | match details |
| Charleston Challenger - Hard |
| 24.09.24 1st round | vs. Naoki Nakagawa | 2-6, 2-6 | | match details |
| M15 Fayetteville - Hard |
| 16.09.24 q 1 | vs. Tyler Bowers | 5-7, 1-6 | | match details |
| M15 Huntsville - Clay |
| 12.08.24 qual. | vs. Ryan Colby | 2-6, 1-6 | | match details |
| 11.08.24 q 1 | vs. Mason Landreth | 1-6, 6-3, 10-5 | | match details |
| M25 Southaven - Hard |
| 05.08.24 q 2 | vs. Rahul Sachdev | 1-6, 7-61, 7-10 | | match details |
| M25 Columbus - I. hard |
| 15.11.23 1st round | vs. Pawit Sornlaksup | 1-6, 2-6 | | match details |
| 14.11.23 qual. | vs. Youssef Kadiri Hassani | 6-4, 6-2 | | match details |
| 13.11.23 q 1 | vs. Reece Yakubov | 6-4, 6-2 | | match details |
| M15 Winston - Hard |
| 08.11.23 1st round | vs. Marcus McDaniel | 6-72, 0-6 | | match details |
| 07.11.23 qual. | vs. Jared Thompkins | 6-4, 7-5 | | match details |
