2006: Turned Professional

Demoliner turned professional in 2006, playing smaller tournaments (Futures). In 2007, he played his 1st Challenger. At this time, he was considered one of the promises of the sport in Brazil.^[1]

2009-2012: First singles Challenger title, new partnership with Souza

In 2009, he entered the top 300 and won his first Challenger title in Blumenau. In 2011, again achieved good results in Blumenau Challenger, being runner-up. These were the two best results in singles thus far.^[1]

In doubles, Demoliner won two Challenger titles in 2009. However, only in 2012 formed a fixed partnership with João Souza, aiming to become an ATP-level doubles player. The partnership began in September and quickly obtained good results: five Challenger finals in a row, with two runners-up (Cali and Quito) and three titles (Campinas, Rio de Janeiro, and Porto Alegre). With this, Demoliner was approaching the top 100 at doubles.^[1]

2013-2016: Top 100 & Major debut, Wimbledon & US Open third rounds

In February 2013, Demoliner first entered the doubles top 100. In the first half of 2013, he won four Challengers in doubles. In June 2013, he participated for the first time in a Grand Slam at the 2013 Wimbledon Championships with compatriot André Sá, losing in the first round to the Bryan brothers, the No. 1 duo in the world. He also reached the semifinals of the ATP 250 Newport in July.^[1]

In 2014 he had, as campaign highlights, the semifinals of the ATP 250 Zagreb and two Challenger titles in Quito and Cordoba.^[1]

In 2015, he won two more Challengers (Cali and Ilkley), reached the third round of Wimbledon, the second round of the US Open, and began to participate in more ATP tournaments.^[1]

In 2016, Demoliner’s best results were two runner-ups at the ATP 250 in Quito and Bastad, the semifinal of the ATP 500 Rio de Janeiro, and the third round at the US Open.^[1]

2017: Mixed doubles semifinal at Wimbledon, four finals, top 35

In 2017, he reached the 3rd round of the Australian Open and got three more runner-ups on the ATP 250 level in São Paulo, Lyon and Chengdu alongside Marcus Daniell. He was also runner-up at the ATP 500 in Vienna alongside Sam Querrey for the very first time at this level.^[1]

2018: First ATP title, second mixed doubles semifinal

In 2018, he won his first ATP 250 title in Antalya with Santiago González. He also was runner-up at ATP 250 Antwerp, and won a Challenger title in Barcelona.^[1]

2019: 100th career win, partnership with Middlekoop

In 2019, he won a Challenger title in Canberra alongside Frenchman Hugo Nys, two ATP 250 runner-ups in Munich and Zhuhai, alongside Indian Divij Sharan and Dutch Matwé Middelkoop respectively and won one ATP 250 title in Moscow alongside Middelkoop, completing his career win number 100.^[1] At the end of the Russian event, Demoliner ended his season aiming for rest and training for 2020 Australian Open alongside Middelkoop in January.^[2]

2020: One title, one final

In 2020, he reached two finals alongside Middlekoop. In the South American swing (clay), they won the Córdoba Open defeating Argentines Leonardo Mayer and Andrés Molteni in the final. In October, they were runner-ups St. Petersburg Open losing to the number 2 seeded pair, Austrian Jürgen Melzer and Frenchman Édouard Roger-Vasselin.

2021: Fourth ATP title, Hiatus due to surgery

In 2021, Demoliner and his current partner Santiago González took the first dose of a COVID-19 vaccine at the 2021 Serbia Open.^[3] In grass season, he won his fourth ATP 250 title at Stuttgart Open defeating Uruguayan Ariel Behar and Gonzalo Escobar from Ecuador. On 31 October, Demoliner announced the end of his season due to a knee injury and soon afterward had a successful surgery.^[4]

2022: First Grand Slam quarterfinal with Sousa

In 2022, Demoliner was expected to return at 2022 Chile Open after four months without playing but withdrew before the tournament. Nine months after his surgery, Demoliner returned at an ATP Challenger Tour event Brawo Open in Germany where partnering Jan-Lennard Struff he won the title.

Using a protected ranking at the US Open, he reached a Grand Slam quarterfinal for the first time in his career with his partner Joao Sousa, having never passed the third round at a Major.^[5][6]

2023: Return to top 100, Fifth title with Vavassori

Ranked No. 98 at the 2023 Grand Prix Hassan II he won his fifth doubles title with Andrea Vavassori. As a result he moved back into the top 75 of the doubles rankings. This year, Demoliner also made the semifinals at the ATP 500 in Halle, was runner-up at the ATP 250 in Gstaad and made semi-finals at the ATPs 250 in Winston-Salem and Buenos Aires.^[7]

At the 2023 Pan American Games, playing in doubles, Demoliner and Gustavo Heide overcame the hostile Chilean crowd and took gold.^[8] Both having to play two finals on the same day, after winning gold in men's and women's doubles, Demoliner and Luisa Stefani went to the mixed doubles final and obtained another medal, now a silver.^[9]

Doubles: 16 (5 titles, 11 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Feb 2016	Ecuador Open, Ecuador	250 Series	Clay	Thomaz Bellucci	Pablo Carreño Busta Guillermo Durán	5–7, 4–6
Loss	0–2	Jul 2016	Swedish Open, Sweden	250 Series	Clay	Marcus Daniell	Marcel Granollers David Marrero	2–6, 3–6
Loss	0–3	Mar 2017	Brasil Open, Brazil	250 Series	Clay	Marcus Daniell	Rogério Dutra Silva André Sá	6–7(5–7), 7–5, [7–10]
Loss	0–4	May 2017	Lyon Open, France	250 Series	Clay	Marcus Daniell	Andrés Molteni Adil Shamasdin	3–6, 6–3, [5–10]
Loss	0–5	Oct 2017	Chengdu Open, China	250 Series	Hard	Marcus Daniell	Jonathan Erlich Aisam-ul-Haq Qureshi	3–6, 6–7(3–7)
Loss	0–6	Oct 2017	Vienna Open, Austria	500 Series	Hard (i)	Sam Querrey	Rohan Bopanna Pablo Cuevas	6–7(7–9), 7–6(7–4), [9–11]
Win	1–6	Jun 2018	Antalya Open, Turkey	250 Series	Grass	Santiago González	Sander Arends Matwé Middelkoop	7–5, 6–7(6–8), [10–8]
Loss	1–7	Oct 2018	European Open, Belgium	250 Series	Hard (i)	Santiago González	Nicolas Mahut Édouard Roger-Vasselin	4–6, 5–7
Loss	1–8	May 2019	Bavarian Championships, Germany	250 Series	Clay	Divij Sharan	Frederik Nielsen Tim Pütz	4–6, 2–6
Loss	1–9	Sep 2019	Zhuhai Championships, China	250 Series	Hard	Matwé Middelkoop	Sander Gillé Joran Vliegen	6–7(2–7), 6–7(4–7)
Win	2–9	Oct 2019	Kremlin Cup, Russia	250 Series	Hard (i)	Matwé Middelkoop	Simone Bolelli Andrés Molteni	6–1, 6–2
Win	3–9	Feb 2020	Córdoba Open, Argentina	250 Series	Clay	Matwé Middelkoop	Leonardo Mayer Andrés Molteni	6–3, 7–6(7–4)
Loss	3–10	Oct 2020	St. Petersburg Open, Russia	500 Series	Hard (i)	Matwé Middelkoop	Jürgen Melzer Édouard Roger-Vasselin	2–6, 6–7(4–7)
Win	4–10	Jun 2021	Stuttgart Open, Germany	250 Series	Grass	Santiago González	Ariel Behar Gonzalo Escobar	4–6, 6–3, [10–8]
Win	5–10	Apr 2023	Grand Prix Hassan II, Morocco	250 Series	Clay	Andrea Vavassori	Alexander Erler Lucas Miedler	6–4, 3–6, [12–10]
Loss	5–11	Jul 2023	Swiss Open Gstaad, Switzerland	250 Series	Clay	Matwé Middelkoop	Dominic Stricker Stan Wawrinka	6-7(8–10), 2–6

Singles: 15 (7–8)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Nov 2007	Brazil F22, Porto Alegre	Futures	Clay	Ricardo Hocevar	6–1, 3–6, 4–6
Loss	0–2	Aug 2008	Brazil F13, Ribeirão Preto	Futures	Clay	Alexandre Bonatto	3–6, 3–6
Win	1–2	Sep 2008	Brazil F21, Aracaju	Futures	Clay (i)	Alejandro Kon	6–4, 7–5
Win	2–2	May 2009	Blumenau, Brazil	Challenger	Clay	Rogério Dutra Silva	6–1, 6–0
Loss	2–3	Jun 2009	Brazil F7, Brasília	Futures	Clay	Leonardo Kirche	7–6(7–4), 6–7(2–7), 4–6
Win	3–3	May 2010	Brazil F6, Caldas Novas	Futures	Hard	Rodrigo Guidolin	7–6(7–5), 6–4
Loss	3–4	May 2010	Brazil F7, Marília	Futures	Clay	Leonardo Kirche	3–6, 4–6
Win	4–4	Jul 2010	Brazil F15, Guarulhos	Futures	Clay	Daniel Dutra da Silva	6–7(4–7), 6–4, 6–4
Loss	4–5	Apr 2011	Blumenau, Brazil	Challenger	Clay	José Acasuso	2–6, 2–6
Loss	4–6	Aug 2011	Brazil F25, Fortaleza	Futures	Clay	Ricardo Hocevar	2–6, 6–7(2–7)
Win	5–6	Feb 2012	Brazil F7, Lages	Futures	Clay	José Pereira	7–5, 6–4
Win	6–6	Jun 2012	Peru F3, Lima	Futures	Clay	Juan-Pablo Amado	7–6(7–3), 6–2
Loss	6–7	Jun 2012	Peru F4, Arequipa	Futures	Clay	Marcelo Arévalo	4–6, 5–7
Win	7–7	Dec 2012	Brazil F35, Gramado	Futures	Hard	Pedro Zerbini	7–5, 6–3
Loss	7–8	Dec 2012	Brazil F36, Porto Alegre	Futures	Clay	Tiago Lopes	4–6, 2–6

Doubles: 63 (35–28)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Mar 2008	Spain F10, Badalona	Futures	Clay	David Rice	David Cañudas-Fernández Óscar Sabate-Bretos	6–3, 6–1
Win	2–0	May 2008	Brazil F4, Caldas Novas	Futures	Hard	André Miele	Mauricio Doria-Medina Rodrigo-Antonio Grilli	6–4, 3–6, [10–6]
Loss	2–1	May 2008	Brazil F5, Uberlândia	Futures	Clay	André Miele	Mauricio Doria-Medina Rodrigo-Antonio Grilli	6–7(3–7), 6–7(3–7)
Loss	2–2	Jun 2008	Brazil F6, Brasília	Futures	Clay	André Miele	Rafael Camilo Rodrigo Guidolin	6–7(4–7), 6–7(2–7)
Win	3–2	Jul 2008	Brazil F12, Brasília	Futures	Clay	André Miele	Tiago Lopes Fernando Romboli	7–5, 6–4
Loss	3–3	Aug 2008	Brazil F14, Jaú	Futures	Clay	Tiago Lopes	Guillermo Bujniewicz Lionel Noviski	6–7(0–7), 6–3, [8–10]
Win	4–3	Aug 2008	Brazil F16, São José do Rio Preto	Futures	Clay	Rodrigo-Antonio Grilli	Marc Auradou José Nascimento	6–2, 6–4
Win	5–3	Sep 2008	Brazil F19, Fortaleza	Futures	Clay	Tiago Lopes	Juan-Pablo Amado Juan-Pablo Yunis	6–3, 6–2
Win	6–3	Mar 2009	Portugal F2, Lagos	Futures	Hard	Rodrigo Guidolin	Aldin Šetkić Aleksander Slović	6–1, 4–6, [12–10]
Loss	6–4	Mar 2009	Portugal F3, Albufeira	Futures	Hard	Rodrigo Guidolin	Aldin Šetkić Aleksander Slović	2–6, 4–6
Loss	6–5	May 2009	Brazil F1, Campinas	Futures	Clay	Rodrigo Guidolin	André Miele Fernando Romboli	6–7(5–7), 7–5, [8–10]
Win	7–5	May 2009	Blumenau, Brazil	Challenger	Clay	Rodrigo Guidolin	Júlio Silva Rogério Dutra Silva	7–5, 4–6, [13–11]
Loss	7–6	May 2009	Brazil F3, Uberlândia	Futures	Clay	Rodrigo Guidolin	Fernando Romboli Júlio Silva	1–6, 4–6
Loss	7–7	Jun 2009	Brazil F8, Divinópolis	Futures	Clay	Rodrigo Guidolin	Tiago Lopes Fabrício Neis	6–7(3–7), 6–7(3–7)
Win	8–7	Aug 2009	Brasília, Brazil	Challenger	Hard	Rodrigo Guidolin	Ricardo Mello Caio Zampieri	6–4, 6–2
Loss	8–8	Jan 2010	Bucaramanga, Colombia	Challenger	Clay	Rodrigo Guidolin	Pere Riba Santiago Ventura	6–2, 6–2
Win	9–8	May 2010	Brazil F7, Marília	Futures	Clay	Rodrigo Guidolin	Luis Díaz Barriga Miguel Ángel Reyes-Varela	4–6, 6–1, [11–9]
Win	10–8	Jul 2010	Brazil F15, Guarulhos	Futures	Clay	Rodrigo Guidolin	Rafael Camilo Fabrício Neis	6–4, 6–3
Loss	10–9	Jul 2010	Brazil F16, Jundiaí	Futures	Clay	Rodrigo Guidolin	Rogério Dutra Silva Júlio Silva	3–6, 2–6
Win	11–9	Dec 2010	Brazil F36, Araçatuba	Futures	Clay	Fernando Romboli	Fabiano de Paula Daniel Dutra da Silva	6–3, 7–6(7–3)
Loss	11–10	Jan 2011	Brazil F4, Recife	Futures	Clay (i)	Fabiano de Paula	Iván Miranda Caio Zampieri	4–6, 7–5, [3–10]
Win	12–10	Jan 2011	Brazil F5, João Pessoa	Futures	Clay	Morgan Phillips	Ariel Behar Luis David Martínez	6–3, 7–5
Loss	12–11	Feb 2011	Brazil F6, Natal	Futures	Clay	Morgan Phillips	Tiago Lopes Iván Miranda	2–6, 1–6
Loss	12–12	Aug 2011	Brazil F25, Fortaleza	Futures	Clay	Rafael Camilo	Guilherme Clezar Caio Zampieri	6–7(3–7), 6–2, [8–10]
Win	13–12	Oct 2011	Brazil F33, São Paulo	Futures	Clay	Fernando Romboli	Daniel Dutra da Silva Caio Zampieri	6–1, 4–6, [10–4]
Win	14–12	May 2012	Peru F1, Chosica	Futures	Clay	Renzo Olivo	Duilio Beretta Sergio Galdós	6–3, 7–6(10–8)
Win	15–12	Jun 2012	Peru F2, Lima	Futures	Clay	Renzo Olivo	Victor Maynard Fernando Romboli	2–6, 7–5, [10–5]
Win	16–12	Jun 2012	Peru F4, Arequipa	Futures	Clay	Marcelo Arévalo	Andrés Ceppo Felipe Mantilla	6–2, 6–2
Loss	16–13	Jun 2012	Peru F5, Trujillo	Futures	Clay	Marcelo Arévalo	Jorge Aguilar Julio César Campozano	4–6, 6–3, [6–10]
Win	17–13	Jun 2012	Peru F6, Lima	Futures	Clay	Renzo Olivo	Duilio Beretta Sergio Galdós	6–4, 6–3
Win	18–13	Jul 2012	Bogotá, Colombia	Challenger	Clay	Víctor Estrella Burgos	Thomas Fabbiano Riccardo Ghedin	6–4, 6–2
Loss	18–14	Sep 2012	Cali, Colombia	Challenger	Clay	João Souza	Juan Sebastián Cabal Robert Farah	3–6, 6–7(4–7)
Win	19–14	Sep 2012	Campinas, Brazil	Challenger	Clay	João Souza	Marcel Felder Máximo González	6–1, 7–5
Win	20–14	Sep 2012	Colombia F3, Cúcuta	Futures	Clay	Guillermo Hormazábal	Ruben Gonzales Chris Letcher	6–4, 3–6, [10–4]
Loss	20–15	Oct 2012	Quito, Ecuador	Challenger	Clay	João Souza	Juan Sebastián Cabal Carlos Salamanca	6–7(7–9), 6–7(4–7)
Win	21–15	Oct 2012	Rio de Janeiro, Brazil	Challenger	Clay	João Souza	Fred Gil Pedro Sousa	6–2, 6–4
Win	22–15	Oct 2012	Porto Alegre, Brazil	Challenger	Clay	João Souza	Simon Greul Alessandro Motti	6–3, 3–6, [10–7]
Loss	22–16	Dec 2012	Brazil F35, Gramado	Futures	Hard	Caio Zampieri	Fabrício Neis Nicolas Santos	7–5, 4–6, [4–10]
Win	23–16	Jan 2013	Bucaramanga, Colombia	Challenger	Clay	Franko Škugor	Sergio Galdós Marco Trungelliti	7–6(10–8), 6–2
Win	24–16	Mar 2013	Santiago, Chile	Challenger	Clay	João Souza	Federico Delbonis Diego Junqueira	7–5, 6–1
Win	25–16	Apr 2013	São Paulo, Brazil	Challenger	Clay	João Souza	James Cerretani Pierre-Hugues Herbert	6–4, 3–6, [10–6]
Win	26–16	May 2013	Rio Quente, Brazil	Challenger	Hard	Fabiano de Paula	Ricardo Hocevar Leonardo Kirche	6–3, 6–4
Loss	26–17	Aug 2013	Rio de Janeiro, Brazil	Challenger	Clay	João Souza	Thiemo de Bakker André Sá	3–6, 2–6
Loss	26–18	Oct 2013	São José do Rio Preto, Brazil	Challenger	Clay	João Souza	Nicolás Barrientos Carlos Salamanca	4–6, 4–6
Loss	26–19	Nov 2013	Lima, Peru	Challenger	Clay	Sergio Galdós	Andrés Molteni Fernando Romboli	4–6, 4–6
Loss	26–20	Sep 2014	Colombia F5, Ibagué	Futures	Clay	Fabiano de Paula	Nicolás Barrientos Dean O'Brien	3–6, 7–5, [7–10]
Win	27–20	Sep 2014	Quito, Ecuador	Challenger	Clay	João Souza	Duilio Beretta Martín Cuevas	6–4, 6–4
Win	28–20	Oct 2014	Córdoba, Argentina	Challenger	Clay	Nicolás Jarry	Hugo Dellien Juan Ignacio Londero	6–3, 7–5
Loss	28–21	Nov 2014	Lima, Peru	Challenger	Clay	Roberto Maytín	Sergio Galdós Guido Pella	3–6, 1–6
Loss	28–22	Apr 2015	Guadalajara, Mexico	Challenger	Hard	Miguel Ángel Reyes-Varela	Austin Krajicek Rajeev Ram	5–7, 6–4, [6–10]
Win	29–22	May 2015	Cali, Colombia	Challenger	Clay	Miguel Ángel Reyes-Varela	Emilio Gómez Roberto Maytín	6–1, 6–2
Loss	29–23	Jun 2015	Surbiton, Great Britain	Challenger	Grass	Marcus Daniell	Ken Skupski Neal Skupski	3–6, 4–6
Win	30–23	Jun 2015	Ilkley, Great Britain	Challenger	Grass	Marcus Daniell	Ken Skupski Neal Skupski	7–6(7–3), 6–4
Loss	30–24	Nov 2015	Montevideo, Uruguay	Challenger	Clay	Gastão Elias	Andrej Martin Hans Podlipnik Castillo	4–6, 6–3, [6–10]
Loss	30–25	Jun 2016	Ilkley, Great Britain	Challenger	Grass	Aisam Qureshi	Wesley Koolhof Matwé Middelkoop	6–7(5–7), 6–0, [8–10]
Win	31–25	Jul 2016	Todi, Italy	Challenger	Clay	Fabrício Neis	Salvatore Caruso Alessandro Giannessi	6–1, 3–6, [10–5]
Win	32–25	Mar 2017	Irving, USA	Challenger	Hard	Marcus Daniell	Oliver Marach Fabrice Martin	6–3, 6–4
Win	33–25	Oct 2018	Barcelona, Spain	Challenger	Clay	David Vega Hernández	Rameez Junaid David Pel	7–6(7–3), 6–3
Loss	33–26	Nov 2018	Buenos Aires, Argentina	Challenger	Clay	Andrés Molteni	Guido Andreozzi Guillermo Durán	4–6, 6–4, [3–10]
Win	34–26	Jan 2019	Canberra, Australia	Challenger	Hard	Hugo Nys	André Göransson Sem Verbeek	3–6, 6–4, [10–3]
Win	35–26	Jul 2022	Braunschweig, Germany	Challenger	Clay	Jan-Lennard Struff	Roman Jebavý Adam Pavlásek	6–4, 7–5
Loss	35–27	Mar 2023	Sanremo, Italy	Challenger	Clay	Nikola Ćaćić	Victor Vlad Cornea Franko Škugor	2–6, 3–6
Loss	35–28	Apr 2023	Oeiras, Portugal	Challenger	Clay	Andrea Vavassori	Victor Vlad Cornea Franko Škugor	6–7(2–7), 6–7(4–7)