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).^[1] 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 tiebreaks. 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.

After his playing career Siemerink was captain of the Dutch Davis Cup team from 2006 until 2016.^[2][3]

Other

In February 2018, Siemerink became team manager of the Amsterdam professional football club AFC Ajax.^[4]

Singles: 12 (4 titles, 8 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Win	1–0	Apr 1991	Singapore, Singapore	World Series	Hard	Gilad Bloom	6–4, 6–3
Loss	1–1	Oct 1991	Vienna, Austria	World Series	Carpet	Michael Stich	4–6, 4–6, 4–6
Loss	1–2	Feb 1993	Marseille, France	World Series	Carpet	Marc Rosset	2–6, 6–7(1–7)
Loss	1–3	Jul 1995	Amsterdam, Netherlands	World Series	Clay	Marcelo Ríos	4–6, 5–7, 4–6
Loss	1–4	Aug 1995	Long Island, United States	International Series	Hard	Yevgeny Kafelnikov	6–7(0–7), 2–6
Loss	1–5	Oct 1995	Basel, Switzerland	World Series	Hard	Jim Courier	7–6(7–2), 6–7(5–7), 7–5, 2–6, 5–7
Win	2–5	Jun 1996	Nottingham, United Kingdom	World Series	Grass	Sandon Stolle	6–3, 7–6(7–0)
Loss	2–6	Aug 1996	New Haven, United States	Championship Series	Hard	Alex O'Brien	6–7(6–8), 4–6
Loss	2–7	Oct 1996	Vienna, Austria	Championship Series	Carpet	Boris Becker	4–6, 7–6(9–7), 2–6, 3–6
Loss	2–8	Nov 1997	Stockholm, Sweden	International Series	Hard	Jonas Björkman	6–3, 6–7(2–7), 2–6, 4–6
Win	3–8	Mar 1998	Rotterdam, Netherlands	World Series	Carpet	Thomas Johansson	7–6(7–2), 6–2
Win	4–8	Sep 1998	Toulouse, France	World Series	Hard	Greg Rusedski	6–4, 6–4

Doubles: 18 (10 titles, 7 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Loss	0–1	Jun 1991	Rosmalen, Netherlands	World Series	Grass	Richard Krajicek	Hendrik Jan Davids Paul Haarhuis	3–6, 6–7
Win	1–1	Jul 1991	Hilversum, Netherlands	World Series	Clay	Richard Krajicek	Francisco Clavet Magnus Gustafsson	7–5, 6–4
Loss	1–2	Oct 1991	Berlin, Germany	World Series	Carpet	Daniel Vacek	Petr Korda Karel Nováček	6–3, 5–7, 5–7
Win	2–2	Mar 1993	Miami, United States	Masters Series	Hard	Richard Krajicek	Patrick McEnroe Jonathan Stark	6–7, 6–4, 7–6
Win	3–2	Feb 1994	Marseille, France	World Series	Carpet	Daniel Vacek	Martin Damm Yevgeny Kafelnikov	6–7, 6–4, 6–1
Win	4–2	Jul 1994	Hilversum, Netherlands	World Series	Clay	Daniel Orsanic	David Adams Andrei Olhovskiy	6–4, 6–2
Loss	4–3	Jan 1995	Doha, Qatar	World Series	Hard	Andrei Olhovskiy	Stefan Edberg Magnus Larsson	6–7, 2–6
Win	5–3	Jun 1995	Rosmalen, Netherlands	World Series	Grass	Richard Krajicek	Hendrik Jan Davids Andrei Olhovskiy	7–5, 6–3
Loss	5–4	Jul 1995	Stuttgart, Germany	Championship Series	Clay	Ellis Ferreira	Tomás Carbonell Francisco Roig	6–3, 3–6, 3–6
Win	6–4	Oct 1995	Vienna, Austria	World Series	Carpet	Ellis Ferreira	Todd Woodbridge Mark Woodforde	6–4, 7–5
Win	7–4	Jan 1996	Sydney, Australia	World Series	Hard	Ellis Ferreira	Patrick McEnroe Sandon Stolle	5–7, 6–4, 6–1
Win	8–4	Apr 1996	Monte Carlo, Monaco	Masters Series	Clay	Ellis Ferreira	Jonas Björkman Nicklas Kulti	2–6, 6–3, 6–2
Loss	8–5	Jan 1997	Sydney, Australia	World Series	Hard	Paul Haarhuis	Luis Lobo Javier Sánchez	4–6, 7–6, 3–6
Loss	8–6	Mar 1998	Copenhagen, Denmark	International Series	Carpet	Brett Steven	Tom Kempers Menno Oosting	4–6, 6–7
Win	9–6	Jun 1998	's-Hertogenbosch, Netherlands	International Series	Grass	Guillaume Raoux	Joshua Eagle Andrew Florent	7–6, 6–2
Loss	9–7	Oct 1998	Toulouse, France	World Series	Hard	Paul Haarhuis	Olivier Delaître Fabrice Santoro	2–6, 4–6
Cancelled	9–7	Jun 1999	's-Hertogenbosch, Netherlands	International Series	Grass	Leander Paes	Ellis Ferreira David Rikl	cancelled (rain)
Win	10–7	May 2000	Orlando, United States	International Series	Clay	Leander Paes	Justin Gimelstob Sébastien Lareau	6–3, 6–4

Singles: 5 (3–2)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Win	1–0	Feb 1991	Telford, United Kingdom	Challenger	Carpet	Martin Laurendeau	6–3, 6–4
Win	2–0	Nov 1994	Aachen, Germany	Challenger	Carpet	David Prinosil	5–7, 7–6, 6–4
Loss	2–1	Aug 2000	Segovia, Spain	Challenger	Hard	Sergi Bruguera	7–5, 3–6, 0–1 ret.
Loss	2–2	Oct 2000	Grenoble, France	Challenger	Hard	Antony Dupuis	6–7(10–12), 6–7(11–13)
Win	3–2	Nov 2000	Charleroi, Belgium	Challenger	Carpet	Paradorn Srichaphan	7–6(7–2), 7–6(10–8)

Doubles: 7 (6–1)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Jul 1990	Tampere, Finland	Challenger	Clay	Mark Koevermans	Massimo Cierro Tobias Svantesson	6–1, 6–2
Win	2–0	Nov 1990	The Hague, Netherlands	Challenger	Carpet	Mark Koevermans	Alexander Mronz Andrei Olhovskiy	6–3, 7–5
Loss	2–1	Feb 1991	Telford, United Kingdom	Challenger	Carpet	Peter Nyborg	Martin Laurendeau Leonardo Lavalle	6–7, 3–6
Win	3–1	Nov 1997	Réunion Island, Réunion	Challenger	Hard	Clinton Ferreira	Álex Calatrava Jérôme Golmard	6–2, 6–3
Win	4–1	Jan 2000	Heilbronn, Germany	Challenger	Carpet	John Van Lottum	Magnus Larsson Fredrik Lovén	7–5, 7–6(8–6)
Win	5–1	Apr 2000	Paget, Bermuda	Challenger	Clay	Leander Paes	Jeff Coetzee Brent Haygarth	6–3, 6–2
Win	6–1	Nov 2000	Aachen, Germany	Challenger	Carpet	Sander Groen	Michael Kohlmann Franz Stauder	6–7(2–7), 7–6(9–7), 6–3

Singles

Doubles