Thiago Seyboth Wild
Thiago Seyboth Wild is a Brazilian tennis player. He won 2018 US Open junior singles title. He reached a career high ATP singles ranking of No. 113 on March 2, 2020 and a career high ITF junior ranking of No. 8 on January 22, 2018. He also has a career high ATP doubles ranking of 393 achieved on February 10, 2020.
Seyboth Wild made his ATP main draw debut at the 2018 Brasil Open after receiving a wildcard into the singles main draw.
He won his first Challenger title at Guayaquil defeating Bolivian Hugo Dellien on November 3, 2019.
At just 19 years old, he won his first ATP Tour title in Santiago defeating Norwegian Casper Ruud on 1 March 2020. By winning this title he became the youngest Brazilian ever to win an ATP title. He also became the champion with the lowest ranking to win an ATP tournament on Latin America, as he was number 182 at the start of the tournament, as well as the first player on the ATP Tour born in or beyond the year 2000 to win a non-exhibition ATP title.
Career
2018: Junior Grand Slam title
Wild became the second Brazilian to win a junior Grand Slam on September 9, joining Tiago Fernandes. He also made the junior semifinal at the Roland Garros, and at the doubles of US Open and French Open.2019: First Challenger title
In November 2019, at the age of 19, he won his first Challenger in Guayaquil, entering the top 300 in the world for the first time. With the title, he jumped to the 235th place in the world ranking, and became the third best tennis player in Brazil at the moment, behind only Thiago Monteiro and João Menezes.2020: Wildcards and first ATP 250 title
In February 2020, he received wildcard to participate in the ATP 500 in Rio de Janeiro, where he defeated the Spaniard top 100 Alejandro Davidovich Fokina in three sets in the first round, in the longest match in the history of the tournament. In the next round, he faced world number 32 Borna Ćorić, losing in the third set tiebreak. With this result, he entered the world top 200 for the first time on February 24, moving to 182nd position in the ranking.In the following week, invited as a wildcard to the ATP 250 in Santiago, the Wild had his best campaign: he defeated Facundo Bagnis, Juan Ignacio Londero and in the quarterfinals, the top seed of the tournament, and champion of the Rio Open, the Chilean Cristian Garín, ranking No. 18, who retired after losing the first set in a tiebreak. In the semifinals he defeated Renzo Olivo in straight sets becoming the youngest Brazilian to reach a final at this level, surpassing the achievements of former world number 1 Gustavo Kuerten, then aged 20, and of Jaime Oncins and Thomaz Bellucci, at 21 years old. He also became the first Brazilian to compete in an ATP level final since Bellucci was runner-up in Houston in April 2017. In the final, he defeated Norwegian Casper Ruud, in three sets, becoming champion at 19 years old, surpassing Kuerten, who won his first ATP title at the age of 20. Wild is also the youngest tennis player to win a title in the Latin American clay court since Rafael Nadal won Acapulco in 2005, at the age of 18. Wild climbed up 69 positions, reaching a career high ATP singles ranking of No. 113, becoming the second-highest ranked tennis player in Brazil.
In March, Seyboth Wild became the first professional tennis player to announce a diagnosis of COVID-19. He is currently being investigated for an alleged breach of quarantine prior to receiving the test results.
ATP career finals
Singles: 1 (1 title)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | 2020 Chile Open – Singles| | Chile Open, Chile | 250 Series | Clay |  Casper Ruud | 7–5, 4–6, 6–3 |
ATP Challenger Tour and ITF Futures finals
Singles: 6 (4 titles, 2 runners-up)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Turkey F39, Antalya | Futures | Clay |  Jordi Samper-Montaña | 6–0, 4–6, 4–6 | |
| Win | 1–1 | Turkey F42, Antalya | Futures | Clay |  Riccardo Bonadio | 6–4, 6–4 | |
| Win | 2–1 | Brazil F1, São José do Rio Preto | Futures | Clay |  Camilo Ugo Carabelli | 7–6, 6–3 | |
| Loss | 2–2 | Brazil F4, Curitiba | Futures | Clay |  João Lucas Reis da Silva | 7–6, 3–6, 2–6 | |
| Win | 3–2 | France M25, Montauban | Futures | Clay |  Hugo Gaston | 6–4, 6–2 | |
| Win | 4–2 | 2019 Challenger Ciudad de Guayaquil – Singles| | Guayaquil, Ecuador | Challenger | Clay |  Hugo Dellien | 6–4, 6–0 |
Doubles: 5 (3 titles, 2 runner up)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Turkey F42, Antalya | Futures | Clay |  Diego Hidalgo |  Koray Kırcı  Takashi Saito | 6–2, 6–3 | |
| Win | 2–0 | Brazil F3, Brasília | Futures | Clay | Tomás Martín Etcheverry | Oscar José Gutierrez Igor Marcondes | 6–7, 7–6, | |
| Loss | 2–1 | France M25, Montauban | Futures | Clay | Dan Added |  Alejandro Gomez  Junior Alexander Ore | 2–6, 2–6 | |
| Win | 3–1 | France M25, Ajaccio | Futures | Hard | Yanais Laurent |  Fabian Fallert Hendrik Jebens | 6–4, 1–6, | |
| Loss | 3–2 | 2019 Challenger Ciudad de Guayaquil – Doubles| | Guayaquil, Ecuador | Challenger | Clay | Pedro Sakamoto |  Ariel Behar Gonzalo Escobar | 6–7, 6–7 |