Country
Birthdate
Height
Weight
Profi since
Play
Ranking's position
Points
Prize money
Birthdate
Height
Weight
Profi since
Play
Ranking's position
Points
Prize money
Ireland
17.04.84, 41 years
180 cm
70 kg
Left-handed
32553 $
17.04.84, 41 years
180 cm
70 kg
Left-handed
32553 $
Tristan Lamasine vs. Colin O'Brien - head to head matches
| 25.02.13 | 2nd round | Tristan Lamasine | Colin O'Brien | 6-0, 6-1 | match details |  Portugal F2 | Hard |
Tristan Lamasine form & Colin O'Brien form
Tristan Lamasine - last matches
 M15 Bucharest - Clay | ||||
| 15.05.25 2nd round | vs. Stefan Adrian Andreescu | 2-6, 2-4, - Tristan Lamasine - retired |  | match details |
| 13.05.25 1st round | vs. Max Schoenhaus | 6-4, 6-4 |  | match details |
 M25 Angers - Clay | ||||
| 25.04.25 1/4 | vs. Nikolay Vylegzhanin | 5-7, 5-7 | | match details |
| 24.04.25 2nd round | vs. Alex Marti Pujolras | 7-5, 7-5 | | match details |
| 22.04.25 1st round | vs. Johan Nikles | 4-6, 6-1, 6-2 | | match details |
| M15 Lons - I. hard | ||||
| 01.04.25 1st round | vs. Lorenzo Rottoli | 4-6, 4-6 | | match details |
| M25 Saint - I. hard | ||||
| 25.03.25 1st round | vs. Raphael Perot | 3-6, 5-7 | | match details |
| M25 Creteil - I. hard | ||||
| 14.03.25 1/4 | vs. Nikolay Vylegzhanin | 3-6, 5-7 | | match details |
| 13.03.25 2nd round | vs. Leo Raquillet | 6-3, 6-4 | | match details |
| 12.03.25 1st round | vs. Maxence Bertimon | 7-64, 3-6, 6-3 | | match details |
| M15 Poitiers - I. hard | ||||
| 09.03.25 fin | vs. Hamish Stewart | 6-3, 6-70, 6-1 | | match details |
| 08.03.25 1/2 | vs. Loann Massard | 7-63, 7-63 | | match details |
| 07.03.25 1/4 | vs. Kenny de Schepper | 4-6, 6-2, 6-4 | | match details |
| 06.03.25 2nd round | vs. Martin Sabas | 6-2, 6-1 | | match details |
| 04.03.25 1st round | vs. Leo Lagarrigue | 6-3, 6-2 | | match details |
 Glasgow Challenger - I. hard | ||||
| 16.02.25 q 1 | vs. Raul Brancaccio | 2-6, 1-6 | | match details |
| M25 Roehampton - I. hard | ||||
| 11.02.25 1st round | vs. Arthur Fery | 3-6, 6-78 | | match details |
 Koblenz Challenger - I. hard | ||||
| 26.01.25 q 1 | vs. Mika Brunold | 4-6, 6-73 | | match details |
| M25 Nussloch - Carpet | ||||
| 21.01.25 1st round | vs. Niels Visker | 6-3, 3-6, 4-6 | | match details |
| M15 Bressuire - I. hard | ||||
| 17.01.25 1/4 | vs. Cyril Vandermeersch | 6-4, 4-6, 3-6 | | match details |
| 16.01.25 2nd round | vs. Arthur Reymond | 6-4, 6-0 | | match details |
| 15.01.25 1st round | vs. Markus Molder | 6-4, 6-2 | | match details |
| Nottingham Challenger - I. hard | ||||
| 07.01.25 1st round | vs. Raul Brancaccio | 4-6, 2-6 | | match details |
| 06.01.25 qual. | vs. Yanaki Milev | 6-3, 6-2 | | match details |
| 05.01.25 q 1 | vs. Charlie Robertson | 4-6, 7-65, 6-3 | | match details |
| Brest Challenger - I. hard | ||||
| 20.10.24 q 1 | vs. Benjamin Hassan | 4-6, 2-6 | | match details |
| St. Brieuc - I. hard | ||||
| 14.10.24 qual. | vs. Mika Brunold | 4-6, 7-5, 2-6 | | match details |
| 13.10.24 q 1 | vs. David Poljak | 6-4, 6-4 | | match details |
| Roanne Challenger - I. hard | ||||
| 07.10.24 qual. | vs. Vitaliy Sachko | 4-6, 1-6 | | match details |
| 06.10.24 q 1 | vs. Ricardas Berankis | 6-4, 6-4 | | match details |
Colin O'Brien - last matches
| Germany F20 - Carpet | ||||
| 21.10.13 1st round | vs. Stefan Seifert | 4-6, 5-7 | | match details |
| France F16 - I. hard | ||||
| 16.09.13 1st round | vs. Michael Lammer | 4-6, 0-6 | | match details |
 Petange Challenger - I. hard | ||||
| 07.09.13 q 1 | vs. Louk Sorensen | 6-3, 3-6, 2-6 | | match details |
| St. Remy - Hard | ||||
| 01.09.13 q 2 | vs. Yannick Jankovits | 6-4, 6-71, 5-7 | | match details |
| 01.09.13 q 1 | vs. Clement Maas | 6-4, 6-4 | | match details |
 Ireland F1 - Carpet | ||||
| 22.07.13 2nd round | vs. Tom Farquharson | 0-6, 6-4, 2-6 | | match details |
| 22.07.13 1st round | vs. Luca Serena | 6-3, 5-7, 6-3 | | match details |
| 22.07.13 2nd round | vs. Tom Farquharson | 0-6, 6-4, 2-6 | | match details |
| 22.07.13 1st round | vs. Luca Serena | 6-3, 5-7, 6-3 | | match details |
| Davis Cup - I. hard | ||||
| 07.04.13 | vs. Harri Heliovaara | Harri Heliovaara - walk over | | match details |
| 07.04.13 | vs. Harri Heliovaara | Harri Heliovaara - walk over | | match details |
| 05.04.13 | vs. Jarkko Nieminen | 1-6, 2-6, 0-6 | | match details |
| 05.04.13 | vs. Jarkko Nieminen | 1-6, 2-6, 0-6 | | match details |
| Portugal F4 - Hard | ||||
| 11.03.13 2nd round | vs. Cristian Rodriguez | 6-4, 4-0, Cristian Rodriguez - retired | | match details |
| 11.03.13 1/2 | vs. Leonardo Tavares | 2-6, 2-6 | | match details |
| 11.03.13 1/4 | vs. Joao Domingues | 7-65, 0-6, 7-5 | | match details |
| 11.03.13 1st round | vs. Enrique Lopez-Perez | 7-5, 6-3 | | match details |
| Portugal F3 - Hard | ||||
| 04.03.13 1st round | vs. Harri Heliovaara | 6-4, 6-1 | | match details |
| 04.03.13 2nd round | vs. Rui Machado | 3-6, 0-6 | | match details |
| Portugal F2 - Hard | ||||
| 25.02.13 2nd round | vs. Tristan Lamasine | 0-6, 1-6 | | match details |
| 25.02.13 1st round | vs. Fabricio Neis | 6-3, 1-6, 6-2 | | match details |
| Heilbronn Challenger - I. hard | ||||
| 24.01.11 q 1 | vs. Dieter Kindlmann | 2-6, 3-6 | | match details |
| Great Britain - I. hard | ||||
| 17.01.11 1st round | vs. Richard Bloomfield | 6-3, 6-2 | | match details |
| 17.01.11 2nd round | vs. Liam Broady | 7-5, 4-6, 2-6 | | match details |
 Czech Republic - Carpet | ||||
| 22.11.10 2nd round | vs. Alexander Bury | 7-63, 1-6, 6-2 | | match details |
| 22.11.10 1/4 | vs. Jan Mertl | 6-75, 5-7 | | match details |
| 22.11.10 1st round | vs. Jakub Lustyk | 7-62, 6-2 | | match details |
| Czech Republic - Carpet | ||||
| 15.11.10 2nd round | vs. Denis Matsukevitch | 1-6, 4-6 | | match details |
| 15.11.10 1st round | vs. Dawid Celt | 7-65, 7-66 | | match details |
 Greece F4 - Hard | ||||
| 01.11.10 1/2 | vs. Sean Thornley | 6-4, 6-3 | | match details |
