Guido Iván Justo| Country (sports) |  Argentina |
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| Born | (1997-12-17) 17 December 1997
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| Height | 1.78 m (5 ft 10 in) |
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| Plays | Right-handed (two-handed backhand) |
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| Coach | Martin Rondina |
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| Prize money | US $156,907 |
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|
| Career record | 0–0 (at ATP Tour level, Grand Slam level, and in Davis Cup) |
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| Career titles | 1 Challenger, 4 ITF |
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| Highest ranking | No. 223 (27 July 2026) |
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| Current ranking | No. 223 (27 July 2026) |
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|
| US Open | Q1 (2026) |
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| Career record | 0–0 (at ATP Tour level, Grand Slam level, and in Davis Cup) |
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| Career titles | 2 ITF |
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| Highest ranking | No. 329 (23 February 2026) |
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| Current ranking | No. 395 (27 July 2026) |
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| Last updated on: 27 July 2026. |
Guido Iván Justo (born 17 December 1997) is an Argentine tennis player. Justo has a career high ATP singles ranking of No. 223 achieved on 27 July 2026 and a career high ATP doubles ranking of No. 329 achieved on 23 February 2026.[1]
Justo has won one ATP Challenger singles title at the 2026 Challenger de Tigre.
ATP Challenger and ITF Tour finals
Singles: 12 (5–7)
| Legend (singles) |
|---|
| ATP Challenger Tour (1–1) |
| Futures/ITF World Tennis Tour (4–6) |
|
| Finals by surface |
|---|
| Hard (0–0) |
| Clay (5–7) |
|
| Result |
W–L |
Date |
Tournament |
Tier |
Surface |
Opponent |
Score |
|---|
| Loss |
0–1 |
Oct 2022 |
M25 Río Cuarto, Argentina |
World Tennis Tour |
Clay |
Hernán Casanova |
2–6, 3–6 |
| Loss |
0–2 |
Aug 2023 |
M15 Arequipa, Peru |
World Tennis Tour |
Clay |
 Álvaro Guillén Meza |
4–6, 3–6 |
| Win |
1–2 |
Oct 2023 |
M15 Castellón, Spain |
World Tennis Tour |
Clay |
 Miguel Damas |
6–3, 6–2 |
| Loss |
1–3 |
Aug 2024 |
M25 Arequipa, Peru |
World Tennis Tour |
Clay |
 Matías Soto |
0–6, 6–7(2-7) |
| Win |
2–3 |
Sep 2024 |
M15 Córdoba, Argentina |
World Tennis Tour |
Clay |
 Pedro Rodrigues |
7–5, 7–5 |
| Win |
3–3 |
Dec 2024 |
M15 Santiago, Chile |
World Tennis Tour |
Clay |
Matías Soto |
0–6, 7–6(7-3), 6–0 |
| Loss |
3–4 |
Jan 2025 |
M15 Santiago, Chile |
World Tennis Tour |
Clay |
Hernán Casanova |
2–6, 6–4, 4–6 |
| Loss |
3–5 |
Jun 2025 |
M15 San Salvador de Jujuy, Argentina |
World Tennis Tour |
Clay |
Lorenzo Joaquín Rodríguez |
1–6, 7–5, 4–6 |
| Loss |
3–6 |
Jun 2025 |
M15 Salta, Argentina |
World Tennis Tour |
Clay |
Santiago de la Fuente |
Walkover |
| Win |
4–6 |
Jul 2025 |
M15 Santiago, Chile |
World Tennis Tour |
Clay |
Lucio Ratti |
6–0, 6–4 |
| Win |
5–6 |
Feb 2026 |
Tigre, Argentina |
Challenger |
Clay |
Lautaro Midón |
4–6, 6–3, 6–0 |
| Loss |
5–7 |
Mar 2026 |
Bucaramanga, Colombia |
Challenger |
Clay |
Matías Soto |
3–6, 3–6 |