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Sebastián Báez (Spanish pronunciation: [seβasˈtjam ˈbaes]; born 28 December 2000) is an Argentine professional tennis player. He has a career-high ATP singles ranking of world No. 18, achieved on 24 June 2024 and a doubles ranking of No. 189, achieved on 29 July 2024. Báez has won seven ATP Tour singles titles. He is currently the No. 2 singles player from Argentina.
| W | F | SF | QF | | RR | Q# | DNQ | A | NH |
| Tournament | 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win % |
| Grand Slam tournaments | ||||||||
| Australian Open | A | 2R | 1R | 3R | 1R | 0 / 4 | 3–4 | 43% |
| French Open | Q1 | 2R | 1R | 2R | 1R | 0 / 4 | 2–4 | 33% |
| Wimbledon | Q1 | 2R | 1R | 1R | 1R | 0 / 4 | 1–4 | 20% |
| US Open | Q3 | 1R | 3R | 2R | 1R | 0 / 4 | 3–4 | 43% |
| Win–loss | 0–0 | 3–4 | 2–4 | 4–4 | 0–4 | 0 / 16 | 9–16 | 36% |
| National representation | ||||||||
| Summer Olympics | A | NH | 3R | NH | 0 / 1 | 2–1 | 67% | |
| ATP 1000 | ||||||||
| Indian Wells Open | A | 1R | 3R | 3R | 1R | 0 / 4 | 2–4 | 33% |
| Miami Open | A | 1R | 2R | 2R | 1R | 0 / 4 | 0–4 | 0% |
| Monte-Carlo Masters | A | 1R | 1R | 1R | 1R | 0 / 4 | 0–4 | 0% |
| Madrid Open | A | A | 3R | 3R | 2R | 0 / 3 | 2–3 | 40% |
| Italian Open | A | 2R | 2R | 4R | 2R | 0 / 4 | 4–4 | 50% |
| Canadian Open | A | 1R | A | A | A | 0 / 1 | 0–1 | 0% |
| Cincinnati Open | A | 1R | A | 2R | 2R | 0 / 3 | 2–3 | 40% |
| Shanghai Masters | NH | 3R | 2R | 2R | 0 / 3 | 2–3 | 40% | |
| Paris Masters | A | 1R | 1R | 1R | 1R | 0 / 4 | 0–4 | 0% |
| Win–loss | 0–0 | 1–7 | 4–7 | 5–8 | 2–8 | 0 / 30 | 12–30 | 29% |
| Career statistics | ||||||||
| Tournaments | 2 | 28 | 29 | 28 | 22 | 109 | ||
| Titles | 0 | 1 | 3 | 2 | 1 | 7 | ||
| Finals | 0 | 3 | 3 | 2 | 3 | 11 | ||
| Overall win–loss | 3–3 | 26–30 | 31–26 | 31–28 | 17–21 | 108–108 | ||
| Win Percentage | 50% | 46% | 54% | 53% | 45% | 50% | ||
| Year-end ranking | 97 | 43 | 28 | 27 | $5,770,847 | |||
| Legend |
| Grand Slam (0–0) |
| ATP 1000 (0–0) |
| ATP 500 (2–0) |
| ATP 250 (5–4) |
| Finals by surface |
| Hard (1–0) |
| Clay (6–4) |
| Grass (0–0) |
| Finals by setting |
| Outdoor (7–4) |
| Indoor (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Feb 2022 | Chile Open, Chile | ATP 250 | Clay | Pedro Martínez | 6–4, 4–6, 4–6 |
| Win | 1–1 | Apr 2022 | Estoril Open, Portugal | ATP 250 | Clay | Frances Tiafoe | 6–3, 6–2 |
| Loss | 1–2 | Jul 2022 | Swedish Open, Sweden | ATP 250 | Clay | Francisco Cerúndolo | 6–7(4–7), 2–6 |
| Win | 2–2 | Feb 2023 | Córdoba Open, Argentina | ATP 250 | Clay | Federico Coria | 6–1, 3–6, 6–3 |
| Win | 3–2 | Aug 2023 | Austrian Open, Austria | ATP 250 | Clay | Dominic Thiem | 6–3, 6–1 |
| Win | 4–2 | Aug 2023 | Winston-Salem Open, US | ATP 250 | Hard | Jiří Lehečka | 6–4, 6–3 |
| Win | 5–2 | Feb 2024 | Rio Open, Brazil | ATP 500 | Clay | Mariano Navone | 6–2, 6–1 |
| Win | 6–2 | Mar 2024 | Chile Open, Chile | ATP 250 | Clay | Alejandro Tabilo | 3–6, 6–0, 6–4 |
| Win | 7–2 | Feb 2025 | Rio Open, Brazil (2) | ATP 500 | Clay | Alexandre Müller | 6–2, 6–3 |
| Loss | 7–3 | Feb 2025 | Chile Open, Chile | ATP 250 | Clay | Laslo Djere | 4–6, 6–3, 5–7 |
| Loss | 7–4 | Apr 2025 | Țiriac Open, Romania | ATP 250 | Clay | Flavio Cobolli | 4–6, 4–6 |
| Legend |
| ATP Challenger Tour (6–3) |
| Finals by surface |
| Hard (0–0) |
| Clay (6–3) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Feb 2021 | Challenger Concepción, Chile | Challenger | Clay | Francisco Cerúndolo | 6–3, 6–7(5–7), 7–6(7–5) |
| Win | 2–0 | Mar 2021 | Challenger de Santiago, Chile | Challenger | Clay | Tomás Barrios Vera | 6–3, 7–6(7–4) |
| Win | 3–0 | May 2021 | Zagreb Open, Croatia | Challenger | Clay | Juan Pablo Varillas | 3–6, 6–3, 6–1 |
| Loss | 3–1 | June 2021 | Slovak Open, Slovakia | Challenger | Clay | Tallon Griekspoor | 6–7(6–8), 3–6 |
| Loss | 3–2 | Sep 2021 | Kyiv Open, Ukraine | Challenger | Clay | Franco Agamenone | 5–7, 2–6 |
| Loss | 3–3 | Oct 2021 | Challenger de Santiago II, Chile | Challenger | Clay | Juan Pablo Varillas | 4–6, 5–7 |
| Win | 4–3 | Oct 2021 | Challenger de Santiago III, Chile | Challenger | Clay | Felipe Meligeni Alves | 3–6, 7–6(8–6), 6–1 |
| Win | 5–3 | Oct 2021 | Buenos Aires Challenger, Argentina | Challenger | Clay | Thiago Monteiro | 6–4, 6–0 |
| Win | 6–3 | Nov 2021 | Internacional de Campinas, Brazil | Challenger | Clay | Thiago Monteiro | 6–1, 6–4 |
| Legend |
| ITF WTT (5–3) |
| Finals by surface |
| Hard (1–0) |
| Clay (4–3) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Apr 2019 | M15 Buenos Aires, Argentina | WTT | Clay | Agustín Velotti | 6–4, 6–0 |
| Win | 2–0 | Jun 2019 | M15 Tabarka, Tunisia | WTT | Clay | Alexander Weis | 6–2, 6–4 |
| Loss | 2–1 | Jul 2019 | M15 Tabarka, Tunisia | WTT | Clay | Enrico Dalla Valle | 6–3, 4–6, 4–6 |
| Win | 3–1 | Jul 2019 | M15 Tabarka, Tunisia | WTT | Clay | Alexander Weis | 6–2, 6–2 |
| Loss | 3–2 | Sep 2019 | M15 Santiago, Chile | WTT | Clay | Juan Manuel Cerúndolo | 1–6, 6–2, 3–6 |
| Win | 4–2 | Oct 2019 | M25 Rio de Janeiro, Brazil | WTT | Clay | Tomás Martín Etcheverry | 4–6, 6–4, 4–1 ret. |
| Win | 5–2 | Jan 2020 | M15 Monastir, Tunisia | WTT | Hard | Gauthier Onclin | 6–1, 6–2 |
| Loss | 5–3 | Sep 2020 | M25 Prague, Czech Republic | WTT | Clay | Jiří Lehečka | 6–3, 3–6, 4–6 |
| Legend |
| ITF Futures/WTT (1–2) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Apr 2018 | Turkey F3, Antalya | Futures | Clay | Juan Pablo Paz | Vít Kopřiva Jaroslav Pospíšil | 2–6, 0–6 |
| Loss | 0–2 | Jun 2019 | M15 Tabarka, Tunisia | WTT | Clay | Nikolás Sánchez Izquierdo | Nicolás Bianchi Genaro Alberto Olivieri | 4–6, 7–5, [4–10] |
| Win | 1–2 | Sep 2020 | M25 Prague, Czech Republic | WTT | Clay | Pedro Cachín | Lucas Miedler Jan Zieliński | 7–6(7–4), 6–1 |
| Result | Year | Tournament | Surface | Opponent | Score |
| Loss | 2018 | French Open | Clay | Tseng Chun-hsin | 6–7(5–7), 2–6 |
| Season | 2022 | 2023 | 2024 | 2025 | Total |
| Wins | 1 | 0 | 0 | 0 | 1 |
| # | Player | Rk | Event | Surface | Rd | Score | Rk | Ref |
| 2022 | ||||||||
| 1. | Andrey Rublev | 8 | Swedish Open, Sweden | Clay | SF | 6–2, 6–4 | 34 | |
| No. | Tournament | Tier | Start date | Surface | Rd | Opponent | Rk | Score |
| – | Hamburg Open | ATP 500 | 23 July 2023 | Clay | 1R | Casper Ruud (1) | 4 | 3–6, 6–1, 3–6 |
| 1 | Generali Open Kitzbühel | ATP 250 | 31 July 2023 | Clay | 1R | Hamad Medjedovic (Q) | 168 | 6–4, 6–2 |
| 2 | 2R | Roberto Carballés Baena | 64 | 6–1, 6–2 | ||||
| 3 | QF | Alex Molčan | 81 | 6–4, 6–3 | ||||
| 4 | SF | Tomás Martín Etcheverry (1) | 34 | 7–6(7–5), 3–6, 6–4 | ||||
| 5 | F | Dominic Thiem (WC) | 94 | 6–3, 6–1 | ||||
| – | Winston-Salem Open | ATP 250 | 20 August 2023 | Hard | 1R | Bye | ||
| 6 | 2R | Daniel Elahi Galán | 67 | 3–6, 6–4, 6–4 | ||||
| 7 | 3R | Aleksandar Vukic (9) | 48 | 6–4, 4–6, 6–4 | ||||
| 8 | QF | Laslo Djere (4) | 34 | 6–3, 6–0 | ||||
| 9 | SF | Borna Ćorić (1) | 16 | 6–3, 6–7(4–7), 7–6(7–2) | ||||
| 10 | F | Jiří Lehečka (5) | 35 | 6–4, 6–3 | ||||
| 11 | US Open | Grand Slam | 28 August 2023 | Hard | 1R | Borna Ćorić (27) | 23 | 7–5, 7–5, 6–1 |
| 12 | 2R | Felipe Meligeni Alves (Q) | 168 | 6–7(7–9), 6–4, 6–4, ret. | ||||
| – | 3R | Daniil Medvedev (3) | 3 | 2–6, 2–6, 6–7(6–8) | ||||
| Sources: | ||||||||
| No. | Tournament | Tier | Start date | Surface | Rd | Opponent | Rk | Score |
| – | Argentina Open | ATP 250 | 12 February 2024 | Clay | QF | Federico Coria (SE) | 106 | 1–6, 4–6 |
| 1 | Rio Open | ATP 500 | 19 February 2024 | Clay | 1R | Corentin Moutet (Q) | 147 | 6–4, 6–3 |
| 2 | 2R | Facundo Díaz Acosta | 59 | 7–6(7–1), 6–1 | ||||
| 3 | QF | Thiago Monteiro (WC) | 117 | 6–4, 1–6, 6–2 | ||||
| 4 | SF | Francisco Cerúndolo (4) | 22 | 7–5, 6–0 | ||||
| 5 | F | Mariano Navone (Q) | 113 | 6–2, 6–1 | ||||
| – | Chile Open | ATP 250 | 24 February 2024 | Clay | 1R | Bye | ||
| 6 | 2R | Juan Pablo Varillas | 119 | 4–6, 6–4, 6–2 | ||||
| 7 | QF | Jaume Munar | 70 | 6–4, 6–4 | ||||
| 8 | SF | Pedro Martínez | 101 | 6–4, 6–2 | ||||
| 9 | F | Alejandro Tabilo (4) | 51 | 3–6, 6–0, 6–4 | ||||
| – | Indian Wells Masters | ATP 1000 | 6 March 2024 | Hard | 1R | Bye | ||
| 10 | 2R | Fabio Fognini (WC) | 108 | 7–5, 6–3 | ||||
| 3R | Taylor Fritz (12) | 12 | 2–6, 2–6 | |||||
| Sources: | ||||||||