Marcos Diniz Daniel (born July 4, 1978, in Passo Fundo, Rio Grande do Sul) is a retired professional tennis player from Brazil who turned professional in 1997. The right-hander reached his highest ATP singles ranking of World No. 56 in September 2009. He is coached by his brother, Márcio.

Marcos Daniel's brother owns an academy for developing young tennis players, called Daniel Tennis Center where Marcos Daniel used to work as a ball catcher. He started playing youth tournaments at age 5. When he was 12, representing this academy, he reached his first final but he did not succeed in winning the title.^[1]

In August 2009, he reached the semi-finals of the ATP Gstaad tournament. He also reached the semi-finals there in 2006.

He qualified for the 2009 French Open and lost in the first round to Rafael Nadal after giving a strong performance, 5–7, 4–6, 3–6.

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Sep 1998	Peru F1, Lima	Futures	Clay	Luis Horna	6–7, 4–6
Loss	0–2	Dec 1998	Brazil F7, Porto Alegre	Futures	Clay	Thomas Schiessling	0–6, 6–7
Loss	0–3	Aug 1999	Uruguay F2, José Ignacio	Futures	Clay	Ricardo Mello	7–6, 5–7, 3–6
Win	1–3	Nov 1999	Brazil F1, Vitória, Espírito Santo	Futures	Clay	Stefano Tarallo	6–3, 6–4
Loss	1–4	Jan 2000	USA F3, Boca Raton	Futures	Hard	Irakli Labadze	4–6, 4–6
Win	2–4	Feb 2001	Mexico F1, Chetumal	Futures	Hard	Nicolás Todero	6–3, 6–0
Win	3–4	Jun 2001	Brazil F4, Florianópolis	Futures	Clay	Júlio Silva	6–7(4–7), 7–5, 7–5
Loss	3–5	Oct 2001	Lima, Peru	Challenger	Clay	Juan Ignacio Chela	2–6, 0–1 ret.
Win	4–5	Apr 2003	Mexico F2, Aguascalientes	Futures	Clay	Andres Pedroso	6–3, 6–4
Win	5–5	Aug 2003	Brazil F5, Fortaleza	Futures	Hard	Miguel Gallardo Valles	6–3, 6–3
Win	6–5	Sep 2003	Gramado, Brazil	Challenger	Hard	José de Armas	7–5, 7–5
Loss	6–6	Jun 2004	Slovenia F1, Kranj	Futures	Clay	Carlos Berlocq	6–7(5–7), 1–6
Win	7–6	Aug 2004	Brazil F4, Florianópolis	Futures	Clay	Júlio Silva	7–5, 2–6, 3–2 ret.
Win	8–6	Sep 2004	Brazil F5, Curitiba	Futures	Clay	Lucas Engel	6–4, 6–4
Win	9–6	Sep 2004	Brazil F6, Porto Alegre	Futures	Clay	Thiago Alves	6–4, 6–2
Loss	9–7	Mar 2005	Brazil F2, Guarulhos	Futures	Clay	Franco Ferreiro	1–6, 3–6
Win	10–7	Jul 2005	Bogotá, Colombia	Challenger	Clay	Jean-Julien Rojer	6–4, 6–4
Loss	10–8	Sep 2005	Seville, Spain	Challenger	Clay	Marco Mirnegg	3–6, 0–3 ret.
Loss	10–9	Oct 2005	Quito, Ecuador	Challenger	Clay	Thiago Alves	6–1, 6–7(1–7), 2–6
Win	11–9	Oct 2005	Bogotá, Colombia	Challenger	Clay	Daniel Köllerer	6–2, 6–3
Win	12–9	Nov 2005	Guayaquil, Ecuador	Challenger	Clay	Flávio Saretta	6–2, 1–6, 6–0
Loss	12–10	Mar 2007	Salinas, Ecuador	Challenger	Hard	Juan Pablo Brzezicki	4–6, 4–6
Win	13–10	Oct 2007	Bogotá, Colombia	Challenger	Clay	Santiago Giraldo	7–6(7–3), 6–4
Loss	13–11	Nov 2007	Buenos Aires, Argentina	Challenger	Clay	Sergio Roitman	1–6, 4–6
Loss	13–12	Nov 2007	Lima, Peru	Challenger	Clay	Pablo Cuevas	6–0, 4–6, 3–6
Win	14–12	Mar 2008	Bogotá, Colombia	Challenger	Clay	Iván Navarro	6–3, 1–6, 6–3
Loss	14–13	Apr 2008	Naples, Italy	Challenger	Clay	Potito Starace	4–6, 6–4, 6–7(3–7)
Win	15–13	Sep 2008	Cali, Colombia	Challenger	Clay	Leonardo Mayer	6–2, ret.
Win	16–13	Sep 2008	Bogotá, Colombia	Challenger	Clay	Horacio Zeballos	6–4, 4–6, 6–4
Win	17–13	Mar 2009	Marrakech, Morocco	Challenger	Clay	Lamine Ouahab	4–6, 7–5, 6–2
Win	18–13	May 2009	Zagreb, Croatia	Challenger	Clay	Olivier Rochus	6–3, 6–4
Win	19–13	Jul 2009	Bogotá, Colombia	Challenger	Clay	Horacio Zeballos	4–6, 7–6(7–5), 6–4
Win	20–13	Apr 2010	Blumenau, Brazil	Challenger	Clay	Bastian Knittel	7–5, 6–7(5–7), 6–4
Loss	20–14	Jul 2010	Braunschweig, Germany	Challenger	Clay	Mikhail Kukushkin	2–6, 0–3 ret.
Win	21–14	Oct 2010	São Paulo, Brazil	Challenger	Clay	Thomaz Bellucci	6–1, 3–6, 6–3
Win	22–14	Nov 2010	Medellín, Colombia	Challenger	Clay	Juan Sebastián Cabal	6–3, 7–5

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Sep 1998	Peru F1, Lima	Futures	Clay	Rodrigo Monte	Luis Horna Rudy Rake	5–7, 7–6, 7–5
Loss	1–1	Oct 1998	Bolivia F2, Cochabamba	Futures	Clay	Rodrigo Monte	Jean-Kome Loglo Lazaro Navarro-Batles	7–5, 4–6, 5–7
Win	2–1	Nov 1998	Brazil F3, Recife	Futures	Hard	Alexandre Simoni	Rainer Gunther Paul Hartveg	6–1, 6–2
Loss	2–2	Nov 1998	Brazil F6, Curitiba	Futures	Clay	Alexandre Simoni	Daniel Melo Antonio Prieto	1–6, 4–6
Win	3–2	Nov 1999	Argentina F5, Lanús	Futures	Clay	Ricardo Schlachter	Enzo Artoni Andrés Schneiter	7–6, 6–7, 6–3
Loss	3–3	Jan 2000	USA F3, Boca Raton	Futures	Hard	Manuel Jorquera	Gareth Williams Jeff Williams	6–7(5–7), 2–6
Loss	3–4	Jun 2001	Brazil F3, São Paulo	Futures	Clay	Ricardo Mello	Adriano Ferreira Diego Veronelli	3–6, 4–6
Loss	3–5	Sep 2001	São Paulo, Brazil	Challenger	Clay	Ricardo Mello	Adriano Ferreira Edgardo Massa	walkover
Loss	3–6	Jun 2002	Eisenach, Germany	Challenger	Clay	Adrián García	Edwin Kempes Martin Verkerk	3–6, 4–6
Win	4–6	Aug 2003	Belo Horizonte, Brazil	Challenger	Hard	Alexandre Simoni	Kentaro Masuda Takahiro Terachi	6–4, 6–2
Win	5–6	Sep 2003	Gramado, Brazil	Challenger	Hard	Alexandre Simoni	Santiago González Alejandro Hernández	7–6(7–5), 6–4
Loss	5–7	Aug 2004	Belo Horizonte, Brazil	Challenger	Hard	Iván Miranda	Sonchat Ratiwatana Sanchai Ratiwatana	2–6, 5–7
Win	6–7	Aug 2004	Manta, Ecuador	Challenger	Hard	Santiago González	Eric Nunez Jimy Szymanski	3–6, 6–2, 7–6(7–5)
Win	7–7	Aug 2004	Brazil F4, Florianópolis	Futures	Clay	Alexandre Simoni	Brian Dabul Alejandro Fabbri	6–3, 7–6(7–3)
Loss	7–8	Jan 2005	São Paulo, Brazil	Challenger	Hard	Tomas Behrend	Bruno Soares André Sá	2–6, 2–6
Loss	7–9	Jan 2005	La Serena, Chile	Challenger	Clay	Tomas Behrend	Enzo Artoni Ramón Delgado	6–7(2–7), 4–6
Loss	7–10	Apr 2005	Mexico City, Mexico	Challenger	Clay	Flávio Saretta	Lukáš Dlouhý Pavel Šnobel	7–5, 4–6, 3–6
Win	8–10	Apr 2005	Bogotá, Colombia	Challenger	Clay	Santiago González	Goran Dragicevic Mirko Pehar	7–6(7–4), 6–3
Loss	8–11	Jul 2005	Bogotá, Colombia	Challenger	Clay	Santiago González	Brian Dabul Marcelo Melo	4–6, 4–6
Win	9–11	Sep 2005	Seville, Spain	Challenger	Clay	Fernando Vicente	Flavio Cipolla Alessandro Motti	6–2, 6–7(1–7), 7–5
Win	10–11	Oct 2005	Bogotá, Colombia	Challenger	Clay	Santiago González	Fred Gil Marcelo Melo	6–2, 7–5
Win	11–11	Oct 2007	Quito, Ecuador	Challenger	Clay	Brian Dabul	Hugo Armando Ricardo Mello	4–6, 7–5, [10–7]
Loss	11–12	Jul 2009	Bogotá, Colombia	Challenger	Clay	Ricardo Mello	Sebastián Prieto Horacio Zeballos	4–6, 5–7

• Marcos Daniel at the Association of Tennis Professionals
• Marcos Daniel at the International Tennis Federation
• Daniel Recent Match Results
• Daniel World Ranking History
• Daniel Tennis Center site^{[permanent dead link‍]}