Rogier Wassen (born 9 August 1976) is a Dutch tennis player who competed regularly on the ATP Tour primarily as a doubles player.

Wassen reached his highest doubles ranking on the ATP Tour on 10 September 2007 when he became World No. 24. The right-hander has won three ATP doubles titles. The Heineken Open in Auckland, New Zealand, in 2006 and 2007 teaming up with Andrei Pavel and Jeff Coetzee respectively. In 2007 he won the Ordina Open in 's-Hertogenbosch, Netherlands, again with Jeff Coetzee. In 2009, he reached the finals of the 2009 Hall of Fame Tennis Championships in Newport, Rhode Island, partnering with Michael Kohlmann.

He is nicknamed "Da Professor" by good friend and doubles partner Dustin Brown. He returned in doubles at 2013 Marburg Open, in partnership with Artem Sitak, losing in the first round against Vahid Mirzadeh and Denis Zivkovic

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Oct 2005	Lyon, France	International Series	Carpet	Jeff Coetzee	Michaël Llodra Fabrice Santoro	3–6, 1–6
Win	1–1	Jan 2006	Auckland, New Zealand	International Series	Hard	Andrei Pavel	Simon Aspelin Todd Perry	6–3, 5–7, [10–4]
Win	2–1	Jan 2007	Auckland, New Zealand	International Series	Hard	Jeff Coetzee	Simon Aspelin Chris Haggard	6–7(9–11), 6–3, [10–2]
Win	3–1	Jun 2007	's-Hertogenbosch, Netherlands	International Series	Grass	Jeff Coetzee	Martin Damm Leander Paes	3–6, 7–6(7–5), [12–10]
Loss	3–2	Jul 2007	Amersfoort, Netherlands	International Series	Clay	Robin Haase	Juan Pablo Brzezicki Juan Pablo Guzmán	2–6, 0–6
Loss	3–3	Mar 2008	Zagreb, Croatia	International Series	Hard	Christopher Kas	Paul Hanley Jordan Kerr	3–6, 6–3, [8–10]
Win	4–3	Jul 2008	Amersfoort, Netherlands	International Series	Clay	František Čermák	Jesse Huta Galung Igor Sijsling	7–5, 7–5
Loss	4–4	Feb 2009	Zagreb, Croatia	250 Series	Hard	Christopher Kas	Martin Damm Robert Lindstedt	4–6, 3–6
Loss	4–5	Jul 2009	Newport, United States	250 Series	Grass	Michael Kohlmann	Jordan Kerr Rajeev Ram	7–6(8–6), 6–7(7–9), [6–10]
Win	5–5	Mar 2010	Metz, France	250 Series	Hard	Dustin Brown	Marcelo Melo Bruno Soares	6–3, 6–3

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Nov 1997	Guadalajara, Mexico	Challenger	Clay	Younes El Aynaoui	4–6, 7–6, 4–6
Loss	0–2	May 1998	Medellín, Colombia	Challenger	Clay	Adriano Ferreira	0–6, 4–6
Loss	0–3	Jun 1998	Oberstaufen, Germany	Challenger	Clay	Wolfgang Schranz	4–6, 2–6
Win	1–3	Nov 1998	Toluca, Mexico	Challenger	Clay	Gastón Etlis	5–7, 6–1, 6–4
Win	2–3	Oct 1999	France F13, Nevers	Futures	Hard	Jean-François Bachelot	3–6, 6–2, 6–4
Win	3–3	Nov 1999	Tunisia F2, Tunis	Futures	Clay	Riccardo Ciruolo	5–7, 7–5, 6–0
Win	4–3	Apr 2001	Kuwait F2, Mishref	Futures	Hard	Mirko Pehar	6–1, 6–1
Win	5–3	May 2001	Austria F2, Telfs	Futures	Clay	Joachim Johansson	walkover
Loss	5–4	Jan 2003	El Salvador F1, San Salvador	Futures	Clay	Juan Pablo Brzezicki	3–6, 1–6

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Aug 1996	Samarkand, Uzbekistan	Challenger	Clay	Martin Hromec	José Frontera Oleg Ogorodov	3–6, 4–6
Loss	0–2	Nov 1997	Ixtapa, Mexico	Challenger	Hard	Bernardo Martínez	Chris Haggard Maurice Ruah	4–6, 6–7
Loss	0–3	Dec 1997	Eilat, Israel	Challenger	Hard	Sander Groen	Patrick Baur Andrei Cherkasov	3–6, 6–7
Loss	0–4	Jul 1998	Montauban, France	Challenger	Clay	Edwin Kempes	Eduardo Nicolás Espin Germán Puentes Alcañiz	5–7, 5–7
Win	1–4	Jul 1998	Oberstaufen, Germany	Challenger	Clay	Nuno Marques	Omar Camporese Dušan Vemić	7–6, 7–6
Loss	1–5	Sep 1998	Seville, Spain	Challenger	Clay	Edwin Kempes	Alberto Martín Salvador Navarro	6–2, 5–7, 3–6
Loss	1–6	Nov 1998	Toluca, Mexico	Challenger	Clay	Edwin Kempes	Alejandro Hernández Mariano Sánchez	3–6, 4–6
Loss	1–7	Jul 1999	Montauban, France	Challenger	Clay	Ali Hamadeh	Simon Aspelin Ota Fukárek	3–6, 4–6
Win	2–7	Sep 2000	France F18, Mulhouse	Futures	Hard	Ville Liukko	Shaun Rudman Wesley Moodie	7–5, 6–3
Win	3–7	Apr 2001	France F8, Saint-Brieuc	Futures	Clay	Cristian Kordasz	Marc Gicquel Régis Lavergne	6–4, 7–6(10–8)
Loss	3–8	Apr 2001	Kuwait F1, Mishref	Futures	Hard	Kamil Patel	Igor Brukner Martin Hromec	4–6, 3–6
Win	4–8	Jun 2001	Germany F5, Trier	Futures	Clay	Cristian Kordasz	Dirk Britzen Bjorn Behles	6–1, 6–4
Win	5–8	Oct 2001	Bukhara, Uzbekistan	Challenger	Hard	Aisam Qureshi	Alexey Kedryuk Alexander Shvets	6–2, 6–4
Win	6–8	Oct 2001	Quito, Ecuador	Challenger	Clay	Ricardo Schlachter	Hugo Armando Diego del Río	6–7(8–10), 6–4, 7–6(9–7)
Loss	6–9	Oct 2001	Colombia F2, Bogotá	Futures	Clay	Damián Furmanski	Patricio Rudi Gustavo Marcaccio	walkover
Loss	6–10	Apr 2002	USA F12, Tampa	Futures	Clay	Jason Marshall	Thomas Blake Levar Harper-Griffith	6–2, 4–6, 3–6
Win	7–10	Sep 2002	Samarkand, Uzbekistan	Challenger	Clay	Federico Browne	Vadim Kutsenko Oleg Ogorodov	3–6, 7–6(7–3), 7–6(7–3)
Loss	7–11	Oct 2002	Seoul, South Korea	Challenger	Hard	Federico Browne	Jaymon Crabb Mark Nielsen	walkover
Loss	7–12	Dec 2002	Bangkok, Thailand	Challenger	Hard	Federico Browne	Jaymon Crabb Anthony Ross	walkover
Win	8–12	Jan 2003	São Paulo, Brazil	Challenger	Hard	Federico Browne	Ignacio Hirigoyen Andy Ram	7–6(7–0), 7–6(7–3)
Win	9–12	Mar 2003	Tasmania, Australia	Challenger	Hard	Federico Browne	Alun Jones Raphael Durek	1–6, 6–3, 6–2
Win	10–12	Apr 2003	Qatar F1, Doha	Futures	Hard	Benjamin Cassaigne	Jonathan Marray David Sherwood	3–6, 7–6(8–6), 6–3
Win	11–12	Jun 2003	Reggio Emilia, Italy	Challenger	Clay	Joseph Sirianni	Alessio di Mauro Vincenzo Santopadre	6–4, 6–4
Win	12–12	Jul 2003	Montauban, France	Challenger	Clay	Fred Hemmes	Juan Pablo Guzmán Ignacio Hirigoyen	6–4, 6–4
Win	13–12	Aug 2003	Mönchengladbach, Germany	Challenger	Clay	Irakli Labadze	Karsten Braasch Franz Stauder	6–7(4–7), 6–2, 6–2
Win	14–12	Sep 2003	Brașov, Romania	Challenger	Clay	Alexander Peya	Leonardo Azzaro Stefano Galvani	6–2, 6–4
Win	15–12	Oct 2003	Reunion Island, Reunion	Challenger	Hard	Federico Browne	Fred Hemmes Peter Wessels	6–1, 6–7(4–7), 6–3
Loss	15–13	Dec 2003	Iran F3, Kish Island	Futures	Clay	Johannes Ager	Adrian Barbu Gabriel Moraru	4–6, 6–4, 2–6
Loss	15–14	Feb 2004	Andrezieux, France	Challenger	Hard	Alexander Peya	Yves Allegro Jean-François Bachelot	4–6, 7–5, 4–6
Win	16–14	Mar 2004	Besançon, France	Challenger	Hard	Alexander Waske	Kenneth Carlsen Gilles Elseneer	3–6, 7–5, 6–3
Loss	16–15	Mar 2004	Mexico City, Mexico	Challenger	Clay	Federico Browne	Ashley Fisher Tripp Phillips	4–6, 6–2, 3–6
Win	17–15	Apr 2004	San Luis Potosí, Mexico	Challenger	Clay	Tuomas Ketola	Marcello Amador Jorge Haro	6–2, 6–2
Loss	17–16	May 2004	Aix-en-Provence, France	Challenger	Clay	Federico Browne	Thierry Ascione Jean-François Bachelot	4–6, 7–5, 4–6
Loss	17–17	Jul 2004	Zell, Germany	Challenger	Clay	Werner Eschauer	Alexander Waske Jean-Claude Scherrer	6–4, 4–6, 3–6
Loss	17–18	Aug 2004	Manerbio, Italy	Challenger	Clay	Johan Landsberg	Martin Štěpánek Petr Luxa	4–6, 2–6
Win	18–18	Nov 2004	Groningen, Netherlands	Challenger	Hard	Alexander Waske	Romano Frantzen Floris Kilian	6–1, 6–2
Win	19–18	Dec 2004	Kish Island, Iran	Challenger	Clay	Tomas Behrend	Adam Chadaj Filip Urban	3–6, 6–2, 6–4
Loss	19–19	May 2005	Prague, Czech Republic	Challenger	Clay	Travis Parrott	Jordan Kerr Sebastián Prieto	4–6, 3–6
Win	20–19	Aug 2005	Manerbio, Italy	Challenger	Clay	Melle van Gemerden	Daniel Köllerer Oliver Marach	6–3, 6–4
Win	21–19	Oct 2005	Southampton, United Kingdom	Challenger	Hard	Melle van Gemerden	Travis Parrott Tripp Phillips	6–7(8–10), 6–4, [10–4]
Loss	21–20	Nov 2005	Luxembourg, Luxembourg	Challenger	Hard	Robert Lindstedt	Eric Butorac Chris Drake	6–4, 3–6, 4–6
Win	22–20	Apr 2006	Mexico City, Mexico	Challenger	Clay	Tripp Phillips	Michael Kohlmann Alexander Waske	6–7(4–7), 6–4, [13–11]
Win	23–20	Oct 2006	Kolding, Denmark	Challenger	Hard	Jeff Coetzee	Travis Parrott Eric Butorac	4–6, 6–4, [10–5]
Loss	23–21	Mar 2009	Sarajevo, Bosnia & Herzegovina	Challenger	Hard	James Auckland	Konstantin Kravchuk Dawid Olejniczak	2–6, 6–3, [7–10]
Loss	23–22	Jul 2009	Poznań, Poland	Challenger	Clay	Michael Kohlmann	Sergio Roitman Alexandre Sidorenko	4–6, 4–6
Loss	23–23	Nov 2009	Astana, Kazakhstan	Challenger	Hard	David Martin	Jonathan Marray Jamie Murray	6–4, 3–6, [5–10]
Win	24–23	Aug 2010	Cordenons, Italy	Challenger	Clay	Robin Haase	Adil Shamasdin James Cerretani	7–6(16–14), 7–5
Win	25–23	Aug 2010	Kitzbühel, Austria	Challenger	Clay	Dustin Brown	Hans Podlipnik Castillo Max Raditschnigg	3–6, 7–5, [10–7]
Win	26–23	Sep 2010	Szczecin, Poland	Challenger	Clay	Dustin Brown	Rameez Junaid Philipp Marx	6–4, 7–5
Win	27–23	Aug 2013	Germany F12, Wetzlar	Futures	Clay	Wesley Koolhof	Lars Pörschke Julian Lenz	3–6, 6–0, [10–7]

• Rogier Wassen at the Association of Tennis Professionals
• Rogier Wassen at the International Tennis Federation
• Rogier Wassen at the Davis Cup