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|Residence||Monte Carlo, Monaco|
|Born||14 April 1970|
|Height||1.82 m (6 ft 0 in)|
|Plays||Left-handed (one-handed backhand)|
|Prize money||US$ 4,347,693|
|Career record||273–272 (ATP, Grand Prix and Grand Slam level, and Davis Cup)|
|Highest ranking||No. 14 (12 October 1998)|
|Grand Slam Singles results|
|Australian Open||4R (1991)|
|French Open||3R (1997)|
|US Open||4R (1998)|
|Olympic Games||1R (1992, 1996)|
|Career record||203–185 (ATP, Grand Prix and Grand Slam level, and Davis Cup)|
|Highest ranking||No. 16 (14 October 1996)|
Johannes Martinus ("Jan") Siemerink (born 14 April 1970) is a retired professional tennis player from the Netherlands. The former Dutch Davis Cup captain reached a career high ATP world ranking of 14.
As a junior player, Siemerink was the Dutch 18-under champion in 1988. He also won the doubles title at the 1988 Orange Bowl junior championship in Florida.
Siemerink turned professional in 1989. Over the course of his career he won four top-level singles titles (at Singapore in 1991, Nottingham in 1996, and at Rotterdam and Toulouse in 1998). He also won ten tour doubles titles, the most significant of which were the Miami Masters in 1993 and the Monte Carlo Masters in 1996.
Siemerink's best performance at a Grand Slam event came at Wimbledon in 1998, where he reached the quarterfinals by defeating Ctislav Doseděl, David Prinosil, Jonas Björkman and Magnus Larsson before being knocked-out by Goran Ivanišević. Siemerink is also known for winning a fourth set tiebreak against compatriot Richard Krajicek from 6-0 down in the 1994 US Open, though Krajicek eventually won the match.
Siemerink played for the Netherlands in the Davis Cup between 1991 and 2001, compiling a 17–10 record. He helped the Netherlands reach the World Group semifinals in 2001.
Siemerink's career-high rankings were World No. 14 in singles (in 1998) and World No. 16 in doubles (in 1996). His career prize-money totaled $4,347,693.
Singles: 12 (4 titles – 8 runners-up)
|Win||1.||April 1991||Singapore, Singapore||Hard||Gilad Bloom||6–4, 6–3|
|Loss||1.||October 1991||Vienna, Austria||Carpet (i)||Michael Stich||4–6, 4–6, 4–6|
|Loss||2.||February 1993||Marseille, France||Carpet (i)||Marc Rosset||2–6, 6–7(1–7)|
|Loss||3.||July 1995||Amsterdam, The Netherlands||Clay||Marcelo Ríos||4–6, 5–7, 4–6|
|Loss||4.||August 1995||Long Island, USA||Hard||Yevgeny Kafelnikov||6–7(0–7), 2–6|
|Loss||5.||October 1995||Basel, Switzerland||Hard (i)||Jim Courier||7–6(7–2), 6–7(5–7), 7–5, 2–6, 5–7|
|Win||2.||June 1996||Nottingham, UK||Grass||Sandon Stolle||6–3, 7–6(7–0)|
|Loss||6.||August 1996||New Haven, USA||Hard||Alex O'Brien||6–7(6–8), 4–6|
|Loss||7.||13 October 1996||Vienna, Austria||Carpet (i)||Boris Becker||4–6, 7–6(9–7), 2–6, 3–6|
|Loss||8.||November 1997||Stockholm, Sweden||Hard (i)||Jonas Björkman||6–3, 6–7(2–7), 2–6, 4–6|
|Win||3.||March 1998||Rotterdam, Netherlands||Carpet (i)||Thomas Johansson||7–6(7–2), 6–2|
|Win||4.||September 1998||Toulouse, France||Hard (i)||Greg Rusedski||6–4, 6–4|
Doubles: 18 (11–7)
|Loss||1.||June 1991||Rosmalen, The Netherlands||Grass||Richard Krajicek|| Hendrik Jan Davids
|Win||1.||July 1991||Hilversum, The Netherlands||Clay||Richard Krajicek|| Francisco Clavet
|Loss||2.||October 1991||Berlin, Germany||Carpet (i)||Daniel Vacek|| Petr Korda
|6–3, 5–7, 5–7|
|Win||2.||March 1993||Miami, USA||Hard||Richard Krajicek||Patrick McEnroe
|6–7, 6–4, 7–6|
|Win||3.||February 1994||Marseille, France||Carpet (i)||Daniel Vacek|| Martin Damm
|6–7, 6–4, 6–1|
|Win||4.||July 1994||Hilversum, The Netherlands||Clay||Daniel Orsanic|| David Adams
|Loss||3.||January 1995||Doha, Qatar||Hard||Andrei Olhovskiy|| Stefan Edberg
|Win||5.||June 1995||Rosmalen, The Netherlands||Grass||Richard Krajicek|| Hendrik Jan Davids
|Loss||4.||July 1995||Stuttgart, Germany||Clay||Ellis Ferreira|| Tomás Carbonell
|6–3, 3–6, 3–6|
|Win||6.||October 1995||Vienna, Austria||Carpet (i)||Ellis Ferreira|| Todd Woodbridge
|Win||7.||January 1996||Sydney, Australia||Hard||Ellis Ferreira|| Patrick McEnroe
|5–7, 6–4, 6–1|
|Win||8.||April 1996||Monte Carlo, Monaco||Clay||Ellis Ferreira|| Jonas Björkman
|2–6, 6–3, 6–2|
|Loss||5.||January 1997||Sydney, Australia||Hard||Paul Haarhuis|| Luis Lobo
|4–6, 7–6, 3–6|
|Loss||6.||March 1998||Copenhagen, Denmark||Carpet (i)||Brett Steven|| Tom Kempers
|Win||9.||June 1998||Rosmalen, The Netherlands||Grass||Guillaume Raoux|| Joshua Eagle
|Loss||7.||October 1998||Toulouse, France||Hard (i)||Paul Haarhuis|| Olivier Delaître
|Win||10.||June 1999||Rosmalen, The Netherlands||Grass||Leander Paes|| Ellis Ferreira
|Win||11.||May 2000||Orlando, USA||Clay||Leander Paes|| Justin Gimelstob
- "ABN-AMRO; Siemerink wins for home crowd". The New York Times. 9 March 1998.
- Fred Buddenberg (11 December 2006). "Siemerink coach Davis Cup-team". Trouw (in Dutch).
- "Haarhuis vervangt Siemerink na tien jaar als Davis Cup-captain". NU.nl (in Dutch). 16 December 2016.
- Luigi Gatto (10 February 2018). "Former ATP top-15 Jan Siemerink becomes Ajax' team manager". Tennis World.