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|Born||16 June 1970|
|Height||1.95 m (6 ft 5 in)|
|Plays||Right-handed (one-handed backhand)|
|Highest ranking||No. 34 (3 May 1993)|
|Grand Slam Singles results|
|Australian Open||3R (1991)|
|French Open||4R (1992)|
|US Open||1R (1991, 1992, 1993, 1996, 1997)|
|Olympic Games||QF (1992)|
|Highest ranking||No. 22 (10 July 2000) No. 07 (Double team with Daniel Orsanic)|
|Grand Slam Doubles results|
|Australian Open||1R (1992, 2000)|
|French Open||SF (2000)|
|US Open||3R (2000)|
|Davis Cup||SF (1992, 2000)|
Jaime Oncins (born 16 June 1970) is a former professional tennis player from Brazil.
Oncins represented his native country at the 1992 Summer Olympics in Barcelona, where he reached the quarterfinals before falling to Russia's Andrei Cherkasov. The right-hander won two individual career titles (Bologna and Búzios, both in 1992). He reached his highest singles ATP-ranking on May 3, 1993, when he became world no. 34.
Oncins' best performance at a major was at the 1992 French Open, where he reached the Round of 16, losing to eventual finalist, Petr Korda. In the second round of the tournament, Oncins had a famous victory from two sets down against former world no. 1 and three-time French Open champion, Ivan Lendl. Oncins was also the last player that Jimmy Connors beat at the US Open. Connors beat Oncins in straight sets in the first round of the 1992 US Open, which was on Connors' 40th birthday.
Oncins was a runner-up in the Roland Garros mixed doubles event in 2001, with Paola Suárez from Argentina.
Grand Slam finals
Mixed doubles (1 runner-up)
|2001||French Open||Paola Suárez|| Tomás Carbonell
Virginia Ruano Pascual
Singles (2 wins, 3 losses)
|Loss||1.||Oct 1991||Búzios, Brazil||Hard||Jordi Arrese||6–1, 4–6, 0–6|
|Loss||2.||Nov 1991||São Paulo, Brazil||Hard||Christian Miniussi||6–2, 3–6, 4–6|
|Win||1.||May 1992||Bologna, Italy||Clay||Renzo Furlan||6–2, 6–4|
|Win||2.||Nov 1992||Búzios, Brazil||Hard||Luis Herrera||6–3, 6–2|
|Loss||3.||Nov 1992||São Paulo, Brazil||Hard||Luiz Mattar||1–6, 4–6|
Doubles (5 wins, 6 losses)