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|Full name||Iomar do Nascimento|
|Date of birth||8 April 1966|
|Place of birth||Santa Rita, Paraíba, Brazil|
|Height||1.76 m (5 ft 9 1⁄2 in)|
|Playing position||Defensive midfielder|
|1985–1990||Vasco da Gama||79||(7)|
* Senior club appearances and goals counted for the domestic league only|
A former midfielder, Mazinho played 35 internationals for Brazil national team, winning the 1989 Copa América, 1994 FIFA World Cup and the Silver medal at the 1988 Olympics. He was also named in the squads for the 1990 World Cup and 1991 Copa América.
Mazinho played with Vasco da Gama, Palmeiras and Vitória in his homeland, with Lecce and Fiorentina in Italy, and with Valencia, Celta de Vigo and Elche in Spain. Starting his career as left back, he moved to the midfield in the early 1990s.
Mazinho was a three-time winner of the Campeonato Brasileiro (Brazilian championship) with Vasco da Gama and Palmeiras. He received the Brazilian Silver Ball award in 1987 and 1988.
Mazinho earned 35 caps with the Brazil national team, the first coming in May 1989 in a friendly against Peru and the last during the 1994 FIFA World Cup. His main achievement was at the 1994 World Cup where he was the third member of the "three men and baby" celebration with Bebeto and Romário in the quarter-final win against the Netherlands, a tournament Brazil went on to win. Mazinho was also a Copa América winner in 1989 at which point he was playing as a full-back.
Another player nicknamed "Mazinho", real name Waldemar Aureliano de Oliveira Filho, played for Brazil alongside the preceding player at 1991 Copa América. He was known as "Mazinho Oliveira" or "Mazinho II" to avoid confusion.
In January 2009, Mazinho was appointed as a new head coach of Greek side Aris, replacing Spanish Quique Hernández. Mazinho, however, was later replaced with former Valencia coach Héctor Cúper in November 2009.
- Vasco da Gama
- Campeonato Carioca (Rio de Janeiro State championship): 1987, 1988
- Campeonato Brasileiro (Brazilian championship): 1989
- Taça Guanabara: 1987, 1990
- Campeonato Brasileiro (Brazilian championship): 1993, 1994
- Campeonato Paulista (São Paulo State championship): 1993, 1994
- Rio – São Paulo Tournament: 1993
- Placar Bola de Prata: 1987, 1988, 1989;
- South American Player of the Year Silver Ball: 1989
- South American Team of the Year: 1989.
- "Brazil – Record International Players". rsssfbrasil.com. Retrieved 1 October 2011.
- "Mazinho". sambafoot.com. Retrieved 1 October 2011.
- "Mazinho sustituye a Quique Hernández como entrenador del Aris de Salónica" (in Spanish). AS.com. 22 January 2009. Retrieved 22 January 2009.
- McMath, Duncan (24 July 2013). "Thiago was 'close' to joining Man Utd". ESPN FC. Retrieved 31 August 2013.
- "Thiago y Jonathan, ADN fútbol" [Thiago and Jonathan, football DNA]. Mundo Deportivo (in Spanish). 21 August 2009. Retrieved 9 January 2011.
- "South American Team of the Year". RSSF.com. 16 January 2009. Archived from the original on 21 January 2015. Retrieved 30 October 2015.