Junior career

De Bakker finished 2006 as the ITF Junior Champion, after having won the Boys' Singles title at the 2006 Wimbledon Championships.

Early career

De Bakker received a wildcard into the ATP Amersfoort event in July 2006 and defeated top 100 and French Open Quarterfinalist Julien Benneteau in the 1st round, winning in straight sets 6–3, 6–3. In the second round he faced Frenchman Marc Gicquel and lost in three sets. As he was the reigning Junior Champion, De Bakker received a wildcard into the main draw of the 2007 Wimbledon Championships, where he would lose in five tight sets to qualifier Wayne Arthurs.

In October 2006, De Bakker won his first senior international title in a Futures event in Albufeira, Portugal, where he beat Briton Morgan Phillips in the final. This was followed by another win in a Futures tournament two weeks later in San Miguel, Portugal. He reached a career high ATP ranking of 228 on 25 August 2008.

2009

On 22 March 2009, he finished as runner-up in the Caltanissetta Challenger tournament to compatriot Jesse Huta Galung, losing in straight sets. On 5 May 2009, as a qualifier and ranked 236, he defeated the 5th seed Rainer Schüttler in the first round of the BMW Open in Münich in straight sets, before losing to former world number one, Lleyton Hewitt. De Bakker would follow this up in the 2009 Ordina Open, by qualifying for the tournament and losing in the second round to Rainer Schüttler, after defeating Björn Phau in three tight sets. De Bakker hit a rich vein of form in August, winning four Challenger tournaments, and bumping his ranking from 256 to 122, in the span of one month. His form continued in Davis Cup competition, by beating World Number 13 Gaël Monfils in 4 sets, and putting the Netherlands up 1–0 on France, but lost to Jo-Wilfried Tsonga in four tight sets. De Bakker would finish the year ranked 96th.

2010

De Bakker started 2010 in much the same way he finished 2009. He reached the quarter-finals of the 2010 Aircel Chennai Open, after defeating the eighth seed, Rajeev Ram, and compatriot Robin Haase, he lost to Janko Tipsarević. This would boost his ranking to number 81 in the world, and gave him a high enough ranking to receive direct entrance into the 2010 Australian Open men's singles. In his first Grand Slam in three years, the Dutchman was paired up against the 6th seed Andy Roddick. After losing the first set, de Bakker lost the second and third set by one break each.

De Bakker's next tournament was his first ever Masters event, the 2010 BNP Paribas Open in Indian Wells. He started off winning his opening match against Marcos Daniel in straight sets, before advancing to the third round after beating 30th seed Janko Tipsarević where he retired just after five games of play at 3–2 first set. In the third round, he fell to eventual finalist Andy Roddick. De Bakker played his second Masters event two weeks later the 2010 Sony Ericsson Open, winning his first round match against Rajeev Ram in straight sets, before falling again to the eventual finalist, this time Tomáš Berdych with the same scoreline as in Indian Wells.

De Bakker's next Masters event was the 2010 Monte-Carlo Rolex Masters, where he had to qualify this time. After defeating Eduardo Schwank, de Bakker lost to the five-time reigning champion, and world number two, Rafael Nadal. De Bakker lost this match in less than an hour, winning one game in a two sets loss. He then appeared at the 2010 Barcelona Open Banco Sabadell. He took out World No.58 Alejandro Falla, followed by a victory over world No.92 Daniel Gimeno-Traver. In the round of 16, he scored a win over World No.16 (and former World #1) Juan Carlos Ferrero. Before the match, Ferrero had an 18–2 record on clay for the year. He followed it up with his best career victory, with a superb performance to take out World No.10 Jo-Wilfried Tsonga, his first win over a top 10 player. However, his run came to an end against World No.8 Robin Söderling in the semifinals. Thiemo rose to a career high World No.50 as a result of his semifinal appearance there.

Following his performance at Barcelona, de Bakker received a Special Exempt to enter the main draw of Rome Masters where he faced Viktor Troicki in the first round, but retired due to a groin injury.^[1] At the 2010 French Open, he made a third round showing where he lost to an injured Jo-Wilfried Tsonga in four sets.

At the 2010 Wimbledon Championships, de Bakker advanced to the third round of the men's singles tournament after defeating Colombian Santiago Giraldo in a hotly contested five sets win, followed by a more comprehensive defeat of an exhausted John Isner, the winner of the longest tennis match in history, which finished on its third day of play on 24 June, 6–0, 6–3, 6–2. This made Bakker the first, and one of only two players in history to bagel Isner (the other being Jannik Sinner in 2021), before losing in the third round to Paul-Henri Mathieu of France. De Bakker also participated in the men's doubles tournament, in which his partner was his Dutch colleague Haase. After defeating Viktor Troicki and Christopher Kas in the first round, they lost to the Ratiwatana twins, who entered the main tournament as lucky losers, in 4 sets. As a result, he reached the top 40 in singles on 19 July 2010.

At the 2010 Pilot Pen Tennis, Thiemo reached his second ATP semi-final. Sergiy Stakhovsky defeated him in two sets.^[2]

2013: Maiden ATP doubles final

He reached his maiden doubles final at the Rotterdam Open with Jesse Huta Galung where he lost to Nenad Zimonjić and Robert Lindstedt.

2024: United Cup selection

In October 2023, he was selected as the No. 2 ATP player at the 2024 United Cup as part of the Netherlands team.^[3]

Doubles: 1 (1 runner-up)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Feb 2013	Rotterdam Open, Netherlands	500 Series	Hard (i)	Jesse Huta Galung	Robert Lindstedt Nenad Zimonjić	7–5, 3–6, [8–10]

Close

Singles: 34 (24–10)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Win	1–0	Oct 2006	Portugal F4, Albufeira	Futures	Hard	Morgan Phillips	7–6(7–5), 6–4
Win	2–0	Oct 2006	Portugal F6, Ponta Delgada	Futures	Hard	David Cañudas-Fernández	6–2, 6–4
Loss	2–1	Nov 2006	Israel F4, Ramat HaSharon	Futures	Hard	Andreas Haider-Maurer	4–6, 4–6
Loss	2–2	Sep 2007	Netherlands F5, Enschede	Futures	Clay	Nick van der Meer	7–6(8–6), 6–7(3–7), 2–6
Loss	2–3	Mar 2008	Portugal F5, Lagos	Futures	Hard	Rui Machado	4–6, 3–6
Win	3–3	Jun 2008	Netherlands F1, Apeldoorn	Futures	Clay	Stéphane Robert	7–6(7–2), 6–1
Win	4–3	Jun 2008	Netherlands F2, Alkmaar	Futures	Clay	Melle van Gemerden	4–6, 6–1, 6–2
Loss	4–4	Mar 2009	Caltanissetta, Italy	Challenger	Clay	Jesse Huta Galung	2–6, 3–6
Win	5–4	Aug 2009	Tampere, Finland	Challenger	Clay	Peter Luczak	6–4, 7–6(9–7)
Win	6–4	Aug 2009	Vigo, Spain	Challenger	Clay	Thierry Ascione	6–4, 4–6, 6–2
Win	7–4	Aug 2009	San Sebastián, Spain	Challenger	Clay	Filip Krajinović	6–2, 6–3
Win	8–4	Sep 2009	Braşov, Romania	Challenger	Clay	Pere Riba	7–5, 6–0
Loss	8–5	May 2012	Spain F13, Getxo	Futures	Clay	Andrea Arnaboldi	6–3, 6–7(4–7), 4–6
Win	9–5	Jun 2012	Netherlands F1, Zuidwolde	Futures	Clay	Nick van der Meer	6–4, 4–6, 6–3
Win	10–5	Jun 2012	Netherlands F2, Alkmaar	Futures	Clay	Gerald Melzer	6–4, 7–5
Loss	10–6	Jul 2012	Netherlands F3, Breda	Futures	Clay	Zhang Ze	4–6, 6–3, 4–6
Win	11–6	Jul 2012	Bercuit, Belgium	Challenger	Clay	Victor Hănescu	6–4, 3–6, 7–5
Win	12–6	Sep 2012	Alphen, Netherlands	Challenger	Clay	Simon Greul	6–4, 6–2
Loss	12–7	Oct 2012	Belém, Brazil	Challenger	Hard	Ricardo Hocevar	6–7(1–7), 6–7(4–7)
Win	13–7	Oct 2012	San Juan, Argentina	Challenger	Clay	Martín Alund	6–2, 3–6, 6–2
Loss	13–8	Mar 2013	Santiago, Chile	Challenger	Clay	Facundo Bagnis	6–7(2–7), 6–7(3–7)
Win	14–8	Apr 2014	Santiago, Chile	Challenger	Clay	James Duckworth	4–6, 7–6(12–10), 6–1
Loss	14–9	Jun 2014	Marburg, Germany	Challenger	Clay	Horacio Zeballos	6–3, 3–6, 3–6
Loss	14–10	May 2015	Bordeaux, France	Challenger	Clay	Thanasi Kokkinakis	4–6, 6–1, 6–7(5–7)
Win	15–10	Oct 2015	Las Vegas, USA	Challenger	Hard	Grega Žemlja	3–6, 6–3, 6–1
Win	16–10	Oct 2015	Monterrey, Mexico	Challenger	Hard	Víctor Estrella Burgos	7–6(7–1), 4–6, 6–3
Win	17–10	Jun 2017	Netherlands F1, Alkmaar	Futures	Clay	Maxime Chazal	6–3, 7–5
Win	18–10	Jul 2017	Netherlands F3, Middelburg	Futures	Clay	Botic van de Zandschulp	6–3, 6–4
Win	19–10	Aug 2017	Netherlands F6, Rotterdam	Futures	Clay	Gijs Brouwer	6–2, 6–3
Win	20–10	Oct 2017	Egypt F29, Sharm El Sheikh	Futures	Hard	Gijs Brouwer	6–3, 7–6(7–3)
Win	21–10	Mar 2018	Italy F2, Santa Margherita di Pula	Futures	Clay	Attila Balázs	6–2, 5–7, 6–1
Win	22–10	Jul 2018	Scheveningen, Netherlands	Challenger	Clay	Yannick Maden	6–2, 6–1
Win	23–10	Sep 2019	M25 Santa Margherita di Pula, Italy	World Tennis Tour	Clay	Lucas Gerch	6–2, 6–4
Win	24–10	Aug 2023	M15 Huy, Belgium	World Tennis Tour	Clay	Sidané Pontjodikromo	6–3, 6–3

Close

Doubles: 18 (13–5)

More information Result, W–L ...

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Sep 2006	Netherlands F7, Almere	Futures	Clay	Antal van der Duim	Jesse Huta Galung Igor Sijsling	4–6, 6–1, 6–4
Loss	1–1	May 2007	Great Britain F10, Edinburgh	Futures	Clay	Pierre-Ludovic Duclos	Olivier Charroin Ludwig Pellerin	4–6, 6–1, 2–6
Loss	1–2	May 2007	Italy F15, Parma	Futures	Clay	Igor Sijsling	Alberto Brizzi Giancarlo Petrazzuolo	6–1, 4–6, 3–6
Win	2–2	Aug 2007	Netherlands F4, Vlaardingen	Futures	Clay	Igor Sijsling	Danny Spierenburg Serinho Wijdenbosch	6–4, 7–6(8–6)
Win	3–2	Aug 2009	Vigo, Spain	Challenger	Clay	Raemon Sluiter	Pedro Clar-Rosselló Albert Ramos	7–5, 6–2
Win	4–2	Sep 2011	Alphen, Netherlands	Challenger	Clay	Antal van der Duim	Matwé Middelkoop Igor Sijsling	6–4, 6–7(4–7), [10–6]
Win	5–2	Jun 2012	Netherlands F1, Zuidwolde	Futures	Clay	Antal van der Duim	Patrik Rosenholm Michael Ryderstedt	6–4, 6–0
Win	6–2	Aug 2013	Rio de Janeiro, Brazil	Challenger	Clay	André Sá	Marcelo Demoliner João Souza	6–3, 6–2
Win	7–2	May 2015	Bordeaux, France	Challenger	Clay	Robin Haase	Lucas Pouille Sergiy Stakhovsky	6–3, 7–5
Loss	7–3	Oct 2015	Casablanca, Morocco	Challenger	Clay	Stephan Fransen	Laurynas Grigelis Mohamed Safwat	4–6, 3–6
Win	8–3	Oct 2015	Monterrey, Mexico	Challenger	Hard	Mark Vervoort	Paolo Lorenzi Fernando Romboli	w/o
Win	9–3	Jan 2018	Egypt F1, Sharm El Sheikh	Futures	Hard	Yannick Mertens	Roberto Marcora Artem Smirnov	7–5, 6–2
Win	10–3	Jan 2018	Egypt F2, Sharm El Sheikh	Futures	Hard	Michiel de Krom	Moez Echargui Anis Ghorbel	6–3, 6–4
Win	11–3	Apr 2019	Sophia Antipolis, France	Challenger	Clay	Robin Haase	Enzo Couacaud Tristan Lamasine	6–4, 6–4
Loss	11–4	May 2019	Ostrava, Czech Republic	Challenger	Clay	Tallon Griekspoor	Luca Margaroli Filip Polášek	4–6, 6–2, [8–10]
Win	12–4	Sep 2019	M25 Santa Margherita di Pula, Italy	World Tennis Tour	Clay	Clement Tabur	Jacopo Berrettini Alessandro Petrone	2–6, 6–1, [10–7]
Loss	12–5	Mar 2023	M25 Palma Nova, Spain	World Tennis Tour	Clay	Mats Hermans	Stefano Travaglia Alexander Weis	5–7, 3–6
Win	13–5	Jun 2023	M15 Jakarta, Indonesia	World Tennis Tour	Hard	Justin Barki	Siddhant Banthia Nitin Kumar Sinha	6–4, 6–3

Close