Thomas Samuel Okker is a Dutch former tennis player who was active from the mid-1960s until 1980. He won the 1973 French Open Doubles, the 1976 US Open Doubles, and two gold medals at the 1965 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. He also was ranked world No. 1 in doubles in 1969.
The 1973 French Open was a tennis tournament that took place on the outdoor clay courts at the Stade Roland Garros in Paris, France. The tournament ran from 21 May until 3 June. It was the 77th staging of the French Open, and the second Grand Slam tennis event of 1973. Ilie Năstase and Margaret Court won the singles titles.
The 1971 Australian Open, also known under its sponsored name Dunlop Australian Open, was a tennis tournament played on outdoor grass courts at the White City Stadium in Sydney, New South Wales, Australia from 7 to 14 March. The tournament was originally scheduled to be played in Melbourne but was moved to Sydney on account of a $125,000 sponsorship deal with Dunlop. The tournament date was moved from its regular January slot to March to accommodate scheduling requirements made by the commercial promoters World Championship Tennis and National Tennis League. It was the 59th edition of the Australian Open, the 17th and final one held in Sydney, and the first Grand Slam tournament of the year. The tournament was part of the 1971 World Championship Tennis circuit. The singles titles were won by Australians Ken Rosewall and Margaret Court. The tiebreak was introduced for all sets except the deciding set.
The 1975 Jean Becker Open, also known as the Paris Open, was a Grand Prix men's tennis tournament played o nindoor carpet courts. It was the 6th edition of the Paris Open. It took place at the Palais omnisports de Paris-Bercy in Paris, France from 27 October through 2 November 1975. Tom Okker won the singles title.
The 1970 Paris Open Indoor Championships was a men's Grand Prix tennis tournament played on indoor carpet courts. It was the 2nd edition of the Paris Open. It took place at the Palais omnisports de Paris-Bercy in Paris, France, and ran from 9 November through 15 November 1970.
The 1976 Paris Open, also known as the Jean Becker Open, was a Grand Prix men's tennis tournament played on indoor carpet courts. It was the 7th edition of the Paris Open. It took place at the Palais omnisports de Paris-Bercy in Paris, France from 25 October through 31 October 1976. Eddie Dibbs won the singles title.
The 1970 Queen's Club Championships, also known by its sponsored name Rothmans Open London Grass Court Championships, was a combined men's and women's tennis tournament played on grass courts at the Queen's Club in London in the United Kingdom. It was a non-tour event, i.e. not part of the 1970 Pepsi-Cola Grand Prix or 1970 World Championship Tennis circuit. It was the 71st edition of the tournament and was held from 15 June through 20 June 1970. First-seeded Rod Laver and Margaret Court won the singles titles. In the final Court was 2–6, 0–5 and 0–15 down against Winnie Shaw but recovered by winning 14 of the last 17 games.
The 1973 Rothmans Canadian Open was a tennis tournament played on outdoor clay courts at the Toronto Lawn Tennis Club in Toronto in Canada that was part of the 1973 Commercial Union Assurance Grand Prix and of the 1973 WTA Tour. The tournament was held from August 20 through August 26, 1973. Tom Okker and Evonne Goolagong won the singles titles.
The 1970 Dutch Open was a combined men's and women's tennis tournament staged in Hilversum, Netherlands. The tournament was played on outdoor clay courts and was held from 3 August until 9 August 1970. It was the 13th edition of the tournament. Tom Okker won the men's singles title and earned $3,000 first-prize money while Margaret Court won the women's singles event.
The 1970 British Hard Court Championships, also known by its sponsored name Rothmans Open Hard Court Championships of Great Britain, was a combined men's and women's tennis tournament played on outdoor clay courts at the West Hants Tennis Club in Bournemouth in the United Kingdom. The men's events were part of the 1970 Pepsi-Cola Grand Prix circuit and categorized as Class 2. It was the 41st edition of the tournament and was held from 27 April to 2 May 1970. Mark Cox and Margaret Court won the singles titles. Cox won £2,000 first-prize money while Court, who successfully defended her 1969 title, received £1,000 for her singles win.
The 1969 South African Open was an independent combined men's and women's tennis tournament played on outdoor hard courts at Ellis Park in Johannesburg, South Africa. It was the 66th edition of the tournament and was held from 1 April through 12 April 1969. Rod Laver won the singles title in the men's division, while Billie Jean King won the singles titles in the women's.
The 1969 Monte Carlo Open was a combined men's and women's tennis tournament played on outdoor clay courts at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France. It was the 63rd edition of the event and was held from 15 April through 21 April 1969. Tom Okker and Ann Jones won the singles titles.
The 1971 Monte Carlo Open was a combined men's and women's tennis tournament played on outdoor clay courts at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France. The men's tournament was part of the 1971 Pepsi-Cola Grand Prix circuit. It was the 65th edition of the event and was held from 12 April through 17 April 1971. Ilie Năstase and Gail Chanfreau won the singles titles.
The 1969 Dutch Open was a combined men's and women's tennis tournament staged in Hilversum, Netherlands. The tournament was played on outdoor clay courts and was held from 28 July to 3 August 1969. It was the 12th edition of the tournament and the second in the Open era of tennis. Tom Okker and Kerry Melville won the singles titles.
The 1969 Italian Open was a combined men's and women's tennis tournament that was played on outdoor clay courts at the Foro Italico in Rome, Italy. It was the 26th edition of the tournament and the first that was open to amateur and professional players. The event was held from 21 April through 28 April 1969 and finished a day late. The singles titles were won by second-seeded John Newcombe and Julie Heldman, the first American female player to win the title in 13 years.
The 1969 German Open Championships was a combined men's and women's tennis tournament played on outdoor red clay courts. It was the 61st edition of the tournament, the second one in the Open Era, and the first edition to offer official prize money. The event took place at the Am Rothenbaum in Hamburg, West Germany, from 5 August through 11 August 1969. First-seeded Tony Roche and Judy Tegart won the singles titles. Tegart also won the doubles and mixed doubles titles.
The 1969 Suisse Open Gstaad was a combined men's and women's professional tennis tournament played on outdoor clay courts in Gstaad, Switzerland. It was the 24thd edition of the tournament, the second in the Open Era, and was held from 22 July through 27 July 1969. Roy Emerson and Françoise Dürr won the singles titles.
The 1970 New Zealand Open, also known by its sponsored name Benson and Hedges Open, was a combined men's and women's tennis tournament played on outdoor grass courts in Auckland, New Zealand from 26 January until 1 February 1970. Roger Taylor and Ann Jones won the singles titles.
The 1973 Rainier International Tennis Classic, also known as the Seattle International, was a men's tennis tournament staged at the Seattle Center Arena in Seattle, Washington in the United States that was part of the Grand Prix circuit and categorized as a Group C event. The tournament was played on indoor carpet courts and was held from September 10 until September 16, 1973. It was the second and last edition of the tournament and second-seeded Tom Okker won the singles title and earned $7,500 first-prize money as well as 20 ranking points.
The 1970 Atlanta Tennis Classic, also known as the Atlanta WCT, was a men's tennis tournament played on outdoor hard courts at the DeKalb Tennis Center in Atlanta, Georgia in the United States that was part of the 1970 World Championship Tennis season. It was the inaugural edition of the tournament and was held from May 6 through May 10, 1970. Tom Okker, who survived a match point in his semifinals match against John Newcombe, won the singles title and the accompanying $5,000 first-prize money.
Tom Okker 
John Newcombe / 