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Thomas Samuel Okker (born 22 February 1944), nicknamed "the Flying Dutchman", is a Dutch formertennis player who was active from the mid-1960s until 1980.^[2] He won the 1973 French Open Doubles, the 1976 US Open Doubles, and twogold medals at the1965 Maccabiah Games in Israel. He was ranked among the world's top-ten singles players for seven consecutive years, 1968–74, reaching a career high of world No. 3 in 1974.^[3] He also was ranked world No. 1 in doubles in 1979.^[3]^[4]

Result	Year	Championship	Surface	Partner	Opponents	Score
Loss	1969	Wimbledon	Grass	Marty Riessen	John Newcombe Tony Roche	5–7, 9–11, 3–6
Loss	1971	Australian Open	Grass	Marty Riessen	John Newcombe Tony Roche	2–6, 6–7
Win	1973	French Open	Clay	John Newcombe	Jimmy Connors Ilie Năstase	6–1, 3–6, 6–3, 5–7, 6–4
Loss	1975	US Open	Grass	Marty Riessen	Jimmy Connors Ilie Năstase	4–6, 6–7
Win	1976	US Open	Grass	Marty Riessen	Paul Kronk Cliff Letcher	6–4, 6–4

Result	No.	Date	Tournament	Surface	Opponent	Score
Loss	1.	1965	Hilversum, Netherlands	Clay	John Newcombe	6–2, 3–6, 6–1, 6–3^[20]
Loss	2.	1966	Bournemouth, England	Clay	Ken Fletcher	5–7, 4–6
Win	1.	1966	Hilversum, Netherlands	Clay	Bob Hewitt	6–3, 6–3, 2–6, 6–3
Win	2.	1967	Paris, France	Wood (i)	Jan Kodeš	6–2, 3–6, 6–3, 6–4
Loss	3.	1967	Brussels, Belgium	Clay	Roy Emerson	6–3, 3–6, 7–5, 6–4
Win	3.	1967	Bristol, England	Grass	Cliff Drysdale	6–2, 5–7, 8–6
Loss	4.	1967	Porto Alegre, Brazil	Clay	Cliff Richey	4–6, 6–3, 3–6, 6–8
Loss	5.	1967	Rio de Janeiro, Brazil	Clay	Thomaz Koch	4–6, 9–11, 6–3, 3–6
Win	4.	1967	East London, South Africa	Clay	Mark Cox	9–7, 7–5
Loss	6.	1968	Bloemfontein, South Africa	Hard	Marty Riessen	5–7, 3–6
Loss	7.	1968	Gstaad, Switzerland	Clay	Cliff Drysdale	3–6, 3–6, 0–6
Win	5.	1968	Kingston, Jamaica	Hard (i)	Manuel Orantes	6–2, 6–4
Win	6.	1968	Barranquilla, Colombia	Clay	Marty Riessen	8–6, 6–3, 6–3
Loss	8.	1968	Willemstad, Curaçao	Clay	Marty Riessen	5–7, 6–3, 11–9, 2–6, 2–6
Win	7.	1968	Johannesburg, South Africa	Hard	Marty Riessen	12–10, 6–1, 6–4
↓ Open era ↓
Win	8.	1968	Rome, Italy	Clay	Bob Hewitt	10–8, 6–8, 6–1, 1–6, 6–0
Loss	9.	1968	West Berlin, West Germany	Clay	Manuel Santana	8–6, 4–6, 1–6, 2–6
Win	9.	1968	Saltsjöbaden, Sweden	Clay	Jan-Erik Lundqvist	6–3, 3–6, 5–7
Loss	10.	1968	Lugano, Switzerland	Clay	Ion Țiriac	8–6, 5–7, 0–6
Runner-up	11.	1968	London, England	Grass	Clark Graebner	final rained out^[20]
Win	10.	1968	Dublin, Ireland	Grass	Lew Hoad	6–1, 6–2
Loss	12.	1968	Gstaad, Switzerland	Clay	Cliff Drysdale	3–6, 3–6, 0–6
Loss	13.	1968	US Open, New York	Grass	Arthur Ashe	12–14, 7–5, 3–6, 6–3, 3–6
Loss	14.	1969	Johannesburg, South Africa	Hard	Rod Laver	3–6, 8–10, 3–6
Win	11.	1969	Monte Carlo, Monaco	Clay	John Newcombe	8–10, 6–1, 7–5, 6–3
Win	12.	1969	Tokyo, Japan	Hard (i)	Roy Emerson	5–7, 6–2, 7–5
Win	13.	1969	Brussels, Belgium	Clay	Željko Franulović	6–4, 1–6, 6–2, 6–3
Win	14.	1969	Amsterdam, Netherlands	Clay	Andrés Gimeno	Round robin^[20]
Win	15.	1969	Milwaukee, United States	Clay	Marty Riessen	Round robin
Loss	15.	1969	Gstaad, Switzerland	Clay	Roy Emerson	1–6, 14–12, 4–6, 4–6
Win	16.	1969	Hilversum, Netherlands	Hard	Roger Taylor	10–8, 7–9, 6–4, 6–4^[21]
Loss	16.	1969	Hamburg, Germany	Clay	Tony Roche	1–6, 7–5, 5–7, 6–8
Win	17.	1969	Newport, United States	Grass	Dennis Ralston	4–6, 6–5, 6–1
Loss	17.	1969	Tucson, United States	Hard	Tony Roche	6–9, 1–6
Loss	18.	1969	Casablanca, Morocco	Clay	Tony Roche	Round robin^[20]
Win	18.	1969	Paris Masters, France	Carpet (i)	Earl Butch Buchholz	8–6, 6–2, 6–1
Loss	19.	1969	Auckland, New Zealand	Grass	Roger Taylor	4–6, 4–6, 1–6
Win	19.	1970	Brussels, Belgium	Clay	Ilie Năstase	6–3, 6–4, 0–6, 4–6, 6–4
Win	20.	1970	Atlanta WCT, United States	Hard	Dennis Ralston	6–4, 10–8, 6–2
Loss	20.	1970	Gstaad, Switzerland	Clay	Tony Roche	5–7, 5–7, 3–6
Win	21.	1970	Leicester, England	Grass	Roger Taylor	6–1, 10–8
Win	22.	1970	Hilversum, Netherlands	Hard	Roger Taylor	4–6, 6–0, 6–1, 6–3
Win	23.	1970	Hamburg, Germany	Clay	Ilie Năstase	4–6, 6–3, 6–3, 6–4
Loss	21.	1970	West Berlin, West Germany	Clay	Rod Laver	Round robin^[20]
Loss	22.	1971	New York, United States	Hard (i)	Rod Laver	5–7, 2–6, 1–6
Loss	23.	1971	Monte Carlo, Monaco	Clay	Ilie Năstase	6–3, 6–8, 1–6, 1–6
Loss	24.	1971	Gstaad, Switzerland	Clay	John Newcombe	2–6, 7–5, 6–1, 5–7, 3–6
Win	24.	1971	Louisville WCT, United States	Clay	Cliff Drysdale	3–6, 6–4, 6–1
Win	25.	1971	Quebec WCT, Canada	Indoor	Rod Laver	6–3, 7–6, 6–7, 6–4
Loss	25.	1971	Montreal, Canada	Clay	John Newcombe	6–7, 6–3, 2–6, 6–7
Loss	26.	1971	Vancouver WCT, Canada	Hard (i)	Ken Rosewall	2–6, 2–6, 4–6
Win	26.	1972	Chicago WCT, United States	Carpet (i)	Arthur Ashe	4–6, 6–2, 6–3
Loss	27.	1972	Boston WCT, United States	Hard	Bob Lutz	4–6, 6–2, 4–6, 4–6
Loss	28.	1972	Stockholm, Sweden	Hard (i)	Stan Smith	4–6, 3–6
Loss	29.	1972	Rotterdam WCT, Netherlands	Carpet (i)	Arthur Ashe	6–3, 2–6, 1–6
Win	27.	1973	Washington WCT, United States	Carpet (i)	Arthur Ashe	6–3, 6–7, 7–6
Win	28.	1973	Hilversum, Netherlands	Clay	Andrés Gimeno	2–6, 6–4, 6–4, 6–7, 6–3
Loss	30.	1973	Washington, D.C., United States	Clay	Arthur Ashe	4–6, 2–6
Win	29.	1973	Toronto, Canada	Clay	Manuel Orantes	6–3, 6–2, 6–1
Win	30.	1973	Seattle, United States	Hard (i)	John Alexander	7–5, 6–4
Loss	31.	1973	Los Angeles, United States	Hard	Jimmy Connors	5–7, 6–7
Win	31.	1973	Chicago, United States	Carpet (i)	John Newcombe	3–6, 7–6, 6–3
Win	32.	1973	Madrid, Spain	Clay	Jaime Fillol	4–6, 6–3, 6–3, 7–5
Win	33.	1973	London, England	Carpet (i)	Ilie Năstase	6–3, 6–4
Loss	32.	1973	Masters, Boston	Carpet (i)	Ilie Năstase	3–6, 5–7, 6–4, 3–6
Win	34.	1974	Toronto WCT, Canada	Carpet (i)	Ilie Năstase	6–3, 6–4
Loss	33.	1974	Washington WCT, United States	Carpet (i)	Ilie Năstase	3–6, 3–6
Win	35.	1974	Rotterdam, Netherlands	Carpet (i)	Tom Gorman	4–6, 7–6, 6–1
Loss	34.	1974	Boston, United States	Clay	Björn Borg	6–7, 1–6, 1–6
Loss	35.	1974	Stockholm, Sweden	Hard (i)	Arthur Ashe	2–6, 2–6
Loss	36.	1975	Rotterdam WCT, Netherlands	Carpet (i)	Arthur Ashe	6–3, 2–6, 4–6
Loss	37.	1975	Johannesburg WCT, South Africa	Hard	Buster Mottram	4–6, 2–6
Loss	38.	1975	Stockholm WCT, Sweden	Carpet (i)	Arthur Ashe	4–6, 2–6
Win	36.	1975	Nottingham, England	Grass	Tony Roche	6–1, 3–6, 6–3
Win	37.	1975	Paris Masters, France	Hard (i)	Arthur Ashe	6–3, 2–6, 6–3, 3–6, 6–4
Win	38.	1977	Richmond WCT, United States	Carpet (i)	Vitas Gerulaitis	3–6, 6–3, 6–4
Loss	39.	1978	Hilversum, Netherlands	Clay	Balázs Taróczy	6–2, 1–6, 2–6, 4–6
Win	39.	1979	Tel Aviv, Israel	Hard	Per Hjertquist	6–4, 6–3

Tournament	1964	1965	1966	1967	1968	1969	1970	1971	1972	1973	1974	1975	1976	1977	1978	1979	1980	1981	SR
Australian Open	A	2R	3R	A	A	1R	QF	SF	A	A	A	A	A	A	A	A	A	A	0 / 5
French Open	A	2R	4R	QF	A	SF	A	A	A	QF	A	A	A	A	1R	A	A	A	0 / 6
Wimbledon	2R	1R	4R	2R	QF	QF	2R	4R	A	A	4R	QF	3R	4R	SF	QF	3R	1R	0 / 16
US Open	1R	A	A	A	F	1R	4R	SF	3R	4R	4R	2R	3R	A	1R	1R	1R	A	0 / 13
Grand Slam SR	0 / 2	0 / 3	0 / 3	0 / 2	0 / 2	0 / 4	0 / 3	0 / 3	0 / 1	0 / 2	0 / 2	0 / 2	0 / 2	0 / 1	0 / 3	0 / 2	0 / 2	0 / 1	0 / 40
Year-end ranking	N/A									4	6	11	23	31	50	56	107	N/A

v t e Tennis world No. 1 men's doubles players
Current ATP world No. 1 in bold, as of week of 24 November 2025 ATP rankings was introduced on 1 March 1976
1–5	Bob Hewitt (1976 – 6 w) Raúl Ramírez (1976/1977 – 62 w) Frew McMillan (1977/1979 – 85 w) Tom Okker (1979 – 11 w) John McEnroe (1979/1989 – 269 w)
6–10	Stan Smith (1981 – 8 w) Paul McNamee (1981 – 3 w) Peter Fleming (1982/1984 – 17 w) Tomáš Šmíd (1984/1985 – 34 w) Anders Järryd (1985/1992 – 107 w)
11–15	Robert Seguso (1985/1988 – 62 w) Ken Flach (1985/1986 – 5 w) Stefan Edberg (1986/1987 – 15 w) Yannick Noah (1986/1987 – 19 w) Slobodan Živojinović (1986 – 7 w)
16–20	Andrés Gómez (1986 – 13 w) Emilio Sánchez (1989 – 6 w) Jim Grabb (1989/1993 – 13 w) Jim Pugh (1989/1990 – 26 w) Danie Visser (1990 – 27 w)
21–25	Rick Leach (1990 – 9 w) Pieter Aldrich (1990 – 19 w) David Pate (1991 – 25 w) John Fitzgerald (1991/1992 – 40 w) Todd Woodbridge (1992/2001 – 204 w)
26–30	Kelly Jones (1992 – 1 w) Mark Woodforde (1992/2000 – 83 w) Richey Reneberg (1993 – 5 w) Patrick Galbraith (1993/1994 – 4 w) Grant Connell (1993/1994 – 17 w)
31–35	Paul Haarhuis (1994/1999 – 71 w) Byron Black (1994 – 8 w) Jonathan Stark (1994 – 6 w) Jacco Eltingh (1995/1998 – 63 w) Mahesh Bhupathi (1999 – 4 w)
36–40	Leander Paes (1999/2000 – 39 w) Jared Palmer (2000/2002 – 39 w) Alex O'Brien (2000 – 5 w) Jonas Björkman (2000/2005 – 74 w) Donald Johnson (2002 – 20 w)
41–45	Mark Knowles (2002/2005 – 65 w) Daniel Nestor (2002/2012 – 108 w) Max Mirnyi (2003/2012 – 57 w) Bob Bryan (2003/2015 – 439 w) Mike Bryan (2003/2019 –506 w)
46–50	Nenad Zimonjić (2008/2010 – 40 w) Marcelo Melo (2015/2018 – 56 w) Jamie Murray (2016 – 9 w) Nicolas Mahut (2016/2017 – 39 w) Henri Kontinen (2017 – 26 w)
51–55	Łukasz Kubot (2018 – 19 w) Mate Pavić (2018/2025 – 97 w) Juan Sebastián Cabal (2019/2020 – 29 w) Robert Farah (2019/2021 – 68 w) Nikola Mektić (2021 – 3 w)
56–60	Joe Salisbury (2022 – 26 w) Rajeev Ram (2022/2023 – 9 w) Wesley Koolhof (2022/2023 – 34 w) Neal Skupski (2022/2023 – 35 w) Austin Krajicek (2023/2024 – 26 w)
61–65	Rohan Bopanna (2024 – 8 w) Matthew Ebden (2024 – 9 w) Marcel Granollers (2024 – 22 w) Horacio Zeballos (2024 – 22 w) Marcelo Arévalo (2024/2025 – 40 w)
66–70	Lloyd Glasspool (2025 – 15 w)
(year first held/year last held – number of weeks (w)) weeks record underlined.

Authority control databases
International	ISNI VIAF GND WorldCat
National	Netherlands
Artists	RKD Artists

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Early life

Tennis career

Davis Cup

Maccabiah Games

Style of play

Halls of Fame

Personal life

Grand Slam finals

Singles: 1 (1 runner-up)

Doubles: 5 (2 titles, 3 runner-ups)

Career finals

Singles: 78 (39 titles, 39 runner-ups)

Doubles: 104 (68 titles, 36 runner-ups)

Grand Slam singles performance timeline

See also

References

External links