Johannes Martinus "Jan" Siemerink (; born 14 April 1970) is a retired tennis player from the Netherlands. The former Dutch Davis Cup captain reached a career-high ATP ranking of 14.

Career Tennis 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 in three tie-breaks. Siemerink is also known for winning a fourth set tie-break 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 semi-finals 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.

After his playing career Siemerink was captain of the Dutch Davis Cup team from 2006 until 2016.

Other In February 2018, Siemerink became team manager of the football club Ajax.

ATP career finals

Singles: 12 (4 titles, 8 runner-ups) LegendGrand Slam Tournaments (0–0)ATP World Tour Finals (0–0)ATP Masters 1000 Series (0–0)ATP 500 Series (0–2)ATP 250 Series (4–6)Finals by surfaceHard (2–4)Clay (0–1)Grass (1–0)Carpet (1–3)Finals by settingOutdoors (2–3)Indoors (2–5)

ResultW–LDateTournamentTierSurfaceOpponentScoreWin1–0Singapore, SingaporeWorld SeriesHard Gilad Bloom6–4, 6–3Loss1–1Vienna, AustriaWorld SeriesCarpet Michael Stich4–6, 4–6, 4–6Loss1–2Marseille, FranceWorld SeriesCarpet Marc Rosset2–6, 6–7(1–7)Loss1–3Amsterdam, NetherlandsWorld SeriesClay Marcelo Ríos4–6, 5–7, 4–6Loss1–4Long Island, United StatesInternational SeriesHard Yevgeny Kafelnikov6–7(0–7), 2–6Loss1–5Basel, SwitzerlandWorld SeriesHard (i) Jim Courier7–6(7–2), 6–7(5–7), 7–5, 2–6, 5–7Win2–5Nottingham, United KingdomWorld SeriesGrass Sandon Stolle6–3, 7–6(7–0)Loss2–6New Haven, United StatesChampionship SeriesHard Alex O'Brien6–7(6–8), 4–6Loss2–7Vienna, AustriaChampionship SeriesCarpet Boris Becker4–6, 7–6(9–7), 2–6, 3–6Loss2–8Stockholm, SwedenInternational SeriesHard (i) Jonas Björkman6–3, 6–7(2–7), 2–6, 4–6Win3–8Rotterdam, NetherlandsWorld SeriesCarpet Thomas Johansson7–6(7–2), 6–2Win4–8Toulouse, FranceWorld SeriesHard (i) Greg Rusedski6–4, 6–4

Doubles: 18 (10 titles, 7 runner-ups) LegendGrand Slam Tournaments (0–0)ATP World Tour Finals (0–0)ATP Masters 1000 Series (2–0)ATP 500 Series (0–1)ATP 250 Series (8–6)Finals by surfaceHard (2–3)Clay (4–1)Grass (2–1)Carpet (2–2)Finals by settingOutdoors (8–4)Indoors (2–3)

ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss0–1Rosmalen, NetherlandsWorld SeriesGrass Richard Krajicek Hendrik Jan Davids Paul Haarhuis3–6, 6–7Win1–1Hilversum, NetherlandsWorld SeriesClay Richard Krajicek Francisco Clavet Magnus Gustafsson7–5, 6–4Loss1–2Berlin, GermanyWorld SeriesCarpet Daniel Vacek Petr Korda Karel Nováček6–3, 5–7, 5–7Win2–2Miami, United StatesMasters SeriesHard Richard Krajicek Patrick McEnroe Jonathan Stark6–7, 6–4, 7–6Win3–2Marseille, FranceWorld SeriesCarpet Daniel Vacek Martin Damm Yevgeny Kafelnikov6–7, 6–4, 6–1Win4–2Hilversum, NetherlandsWorld SeriesClay Daniel Orsanic David Adams Andrei Olhovskiy6–4, 6–2Loss4–3Doha, QatarWorld SeriesHard Andrei Olhovskiy Stefan Edberg Magnus Larsson6–7, 2–6Win5–3Rosmalen, NetherlandsWorld SeriesGrass Richard Krajicek Hendrik Jan Davids Andrei Olhovskiy7–5, 6–3Loss5–4Stuttgart, GermanyChampionship SeriesClay Ellis Ferreira Tomás Carbonell Francisco Roig6–3, 3–6, 3–6Win6–4Vienna, AustriaWorld SeriesCarpet Ellis Ferreira Todd Woodbridge Mark Woodforde6–4, 7–5Win7–4Sydney, AustraliaWorld SeriesHard Ellis Ferreira Patrick McEnroe Sandon Stolle5–7, 6–4, 6–1Win8–4Monte Carlo, MonacoMasters SeriesClay Ellis Ferreira Jonas Björkman Nicklas Kulti2–6, 6–3, 6–2Loss8–5Sydney, AustraliaWorld SeriesHard Paul Haarhuis Luis Lobo Javier Sánchez4–6, 7–6, 3–6Loss8–6Copenhagen, DenmarkInternational SeriesCarpet Brett Steven Tom Kempers Menno Oosting4–6, 6–7Win9–6's-Hertogenbosch, NetherlandsInternational SeriesGrass Guillaume Raoux Joshua Eagle Andrew Florent7–6, 6–2Loss9–7Toulouse, FranceWorld SeriesHard Paul Haarhuis Olivier Delaître Fabrice Santoro2–6, 4–6Cancelled9–7's-Hertogenbosch, NetherlandsInternational SeriesGrass Leander Paes Ellis Ferreira David Riklcancelled (rain)Win10–7Orlando, United StatesInternational SeriesClay Leander Paes Justin Gimelstob Sébastien Lareau6–3, 6–4

ATP Challenger and ITF Futures finals

Singles: 5 (3–2) LegendATP Challenger (3–2)ITF Futures (0–0)Finals by surfaceHard (0–2)Clay (0–0)Grass (0–0)Carpet (3–0)

ResultW–LDateTournamentTierSurfaceOpponentScoreWin1–0Telford, United KingdomChallengerCarpet Martin Laurendeau6–3, 6–4Win2–0Aachen, GermanyChallengerCarpet David Prinosil5–7, 7–6, 6–4Loss2–1Segovia, SpainChallengerHard Sergi Bruguera7–5, 3–6, 0–1 ret.Loss2–2Grenoble, FranceChallengerHard Antony Dupuis6–7(10–12), 6–7(11–13)Win3–2Charleroi, BelgiumChallengerCarpet Paradorn Srichaphan7–6(7–2), 7–6(10–8)

Doubles: 7 (6–1) LegendATP Challenger (6–1)ITF Futures (0–0)Finals by surfaceHard (1–0)Clay (2–0)Grass (0–0)Carpet (3–1)

ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreWin1–0Tampere, FinlandChallengerClay Mark Koevermans Massimo Cierro Tobias Svantesson6–1, 6–2Win2–0The Hague, NetherlandsChallengerCarpet Mark Koevermans Alexander Mronz Andrei Olhovskiy6–3, 7–5Loss2–1Telford, United KingdomChallengerCarpet Peter Nyborg Martin Laurendeau Leonardo Lavalle6–7, 3–6Win3–1Réunion Island, RéunionChallengerHard Clinton Ferreira Álex Calatrava Jérôme Golmard6–2, 6–3Win4–1Heilbronn, GermanyChallengerCarpet John Van Lottum Magnus Larsson Fredrik Lovén7–5, 7–6(8–6)Win5–1Paget, BermudaChallengerClay Leander Paes Jeff Coetzee Brent Haygarth6–3, 6–2Win6–1Aachen, GermanyChallengerCarpet Sander Groen Michael Kohlmann Franz Stauder6–7(2–7), 7–6(9–7), 6–3

Performance timelines

Singles Tournament1990199119921993199419951996199719981999200020012002SRW–LWin %Grand Slam tournamentsAustralian OpenA4R2R3R2R2R3R1R2R1R1R2RA0 / 1112–11French OpenA1R1R1RA1R2R3R1R1RQ11RQ30 / 93–9WimbledonQ11R1R1RA3R1R1RQF1R1R1RA0 / 106–10US OpenA3R3R2R1R1R3R1R4R1R1R2RQ10 / 1111–11Win–loss0–05–43–43–41–23–45–42–48–40–40–32–40–00 / 4132–41National RepresentationSummer Olympic GamesNH1RNot Held1RNot HeldANH0 / 20–2ATP Masters SeriesIndian WellsAAAAAAAAA3RAAA0 / 12–1MiamiA3R1R1R4R4R2R2R3R3RQ22RA0 / 1011–10Monte CarloAA1R1RA2R2R2R1R1RQ1Q1A0 / 73–7HamburgAA1RAA2R1R1R1RAAAA0 / 51–5RomeA1R1R3R2R2R1R2R1R2RAAA0 / 96–9CanadaAAAAAAA2R1R2RAAA0 / 32–3CincinnatiAA1R3RQ13R1RQF3R2RAAA0 / 710–7ParisA1RQ2AA3R1R2R2RAAAA0 / 52–5Win–loss0–02–30–54–44–29–61–67–73–76–60–01–10–00 / 4737–47

Doubles Tournament199019911992199319941995199619971998199920002001SRW–LWin %Grand Slam tournamentsAustralian OpenA1RSF3R2R1R1R1R1R2R2R1R0 / 119–11French OpenA2R1R1RA3R1R3R1R3R1R1R0 / 107–10Wimbledon1R1R1R1RAQFSF1R2RA2R2R0 / 1010–10US OpenA2R1R1R1R1R2R1R1R1R1R1R0 / 112–11Win–loss0–12–44–42–41–25–45–42–41–43–32–41–40 / 4228–42ATP Masters SeriesIndian WellsAAAAAAAAAQ1AA0 / 00–0MiamiAA3RWSF3R3R1RA1RAQ11 / 715–6Monte CarloAA2RQFA2RW1RAAAQ21 / 58–4HamburgAA1RAA2R1R1RAAAA0 / 41–4RomeA2RA1R2RSFSF1RAQ1AA0 / 68–6CanadaAAAAAAA1R2R1RAA0 / 31–3CincinnatiAAQ1QF1RQFSF2R1RAAA0 / 68–6ParisA1RAAA1R2RQ2AAAA0 / 30–3Win–loss0–01–23–310–34–39–612–51–61–20–20–00–02 / 3441–32

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