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.
World Championship Tennis (WCT) was a tour for professional male tennis players established in 1968 and lasted until the emergence of the ATP Tour in 1990. A number of tennis tournaments around the world were affiliated with WCT and players were ranked in a special WCT ranking according to their results in those tournaments.
Stan Smith defeated Jan Kodeš in the final, 3–6, 6–3, 6–2, 7–6(5–3) to win the men's singles tennis title at the 1971 US Open.
Ilie Năstase defeated Arthur Ashe in the final, 3–6, 6–3, 6–7(1–5), 6–4, 6–3 to win the men's singles tennis title at the 1972 US Open.
John Newcombe defeated Jan Kodeš in the final, 6–4, 1–6, 4–6, 6–2, 6–3 to win the men's singles tennis title at the 1973 US Open.
The 1972 Rotterdam Indoors was a men's tennis tournament played on indoor carpet courts. It was the inaugural edition of the event known that year as the Rotterdam Indoors, and was part of the 1972 World Championship Tennis circuit. It took place at the Rotterdam Ahoy indoor sporting arena in Rotterdam, Netherlands, from 12 November through 18 November 1972. Second-seeded Arthur Ashe won the singles title.
The 1969 U.S. Professional Indoor was a men's WCT tennis tournament played on indoor carpet courts. It was played at the Wachovia Spectrum in Philadelphia, Pennsylvania in the United States. It was the second edition of the tournament and was held from February 5 through February 9, 1969. Total attendance for the five-day event was 44,538. Rod Laver won the singles title.
In the 1972 World Championship Tennis Finals - Singles, Ken Rosewall was the defending champion, having previously won the tennis competition, and won in the final 4–6, 6–0, 6–3, 6–7(3–7), 7–6(7–5) against Rod Laver. Of particular note, the final is credited as the "match that made tennis in the United States" because its unprecedented domestic television audience of 23 million fueled a massive increase in the sport's popularity.
Arthur Ashe won in the final of the 1972 World Championship Tennis Winter Finals 6–2, 3–6, 6–3, 3–6, 7–6 against Robert Lutz.
The 1971 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 1971 World Championship Tennis circuit. The tournament was held from August 9 through August 16, 1971. John Newcombe and Françoise Dürr won the singles titles.
The 1972 Stockholm Open was a men's tennis tournament played on hard courts and part of the 1972 Commercial Union Assurance Grand Prix and took place at the Kungliga tennishallen in Stockholm, Sweden. It was the fourth edition of the tournament and was held from 4 November through 10 November 1972. First-seeded Stan Smith won the singles title.
The 1974 Stockholm Open was a men's tennis tournament played on indoor hard courts which was part of the AA category of the 1974 Commercial Union Assurance Grand Prix and took place at the Kungliga tennishallen in Stockholm, Sweden. It was the sixth edition of the tournament and was held from 26 October through 11 November 1974. Fourth-seeded Arthur Ashe won the singles title, his second at the event after 1971, and earned $12,000 first-prize money.
The 1979 Colgate-Palmolive Grand Prix was a professional tennis circuit held that year. It consisted of four Grand Slam tournaments, the Grand Prix tournaments and the Nations Cup, a team event.
The 1971 Pepsi Cola Grand Prix was a professional tennis circuit held that year. It incorporated three of the four grand slam tournaments, the Grand Prix tournaments. It was the second edition of the Grand Prix circuit and was run by the International Lawn Tennis Federation (ITLF). In addition to regular tournament prize money a bonus prize money pool of £60,000 ($150,000) was available to be divided among the 20 highest ranking players after the last tournament. To be eligible for a share of the bonus pool a player had to compete in a minimum of nine tournaments. The circuit culminated in a Masters event in Paris, France for the seven highest point scoring players. Stan Smith was the winner of the circuit with 187 ranking points and four tournament victories.
The 1971 Washington Star International was a men's tennis tournament and was played on outdoor clay courts. The event was the third edition of the tournament and was part of both the 1971 Grand Prix circuit and 1971 World Championship Tennis circuit. It was held in Washington, D.C. from July 12 through July 18, 1971. Ken Rosewall won the singles title and earned a $10,000 first prize.
The 1971 U.S. Pro Tennis Championships was a men's tennis tournament played on outdoor hard courts at the Longwood Cricket Club in Boston, USA and was part of the 1971 World Championship Tennis circuit. It was the 44th edition of the tournament and was held from August 2 through August 8, 1971. Sixth-seeded Ken Rosewall won the singles title, his third U.S. Pro title, and the accompanying $10,000 first-prize money. The final was watched by 5,500 spectators.
The 1972 Washington Star International was a men's tennis tournament that was played on outdoor clay courts at the Washington Tennis Stadium in Washington, D.C. The event was part of the 1972 World Championship Tennis circuit. It was the fourth edition of the tournament and was held from July 17 through July 23, 1972. Tony Roche won the singles title after surviving a match point in the final against Marty Riessen.
The 1972 Charlotte Tennis Classic, also known by its sponsored name North Carolina National Bank Tennis Classic, was a men's tennis tournament played on outdoor clay courts that was part of the World Championship Tennis (WCT) circuit. It was the second edition of the tournament and was held from April 18 through April 23, 1972 at the Julian J. Clark Tennis Stadium, owned by the Olde Providence Racquet Club in Charlotte, North Carolina in the United States. Second-seeded Ken Rosewall won the singles title.
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.
The 1972 Fidelity WCT Tournament, also known as the Richmond WCT, was a men's professional tennis tournament that was part of the Group A of the 1972 World Championship Tennis circuit. It was held on indoor carpet courts at the Richmond Coliseum in Richmond, Virginia in the United States. It was the seventh edition of the tournament and was held from February 2 through February 6, 1972. First-seeded Rod Laver won the singles title and earned $10,000 first-prize money.
John Newcombe 
Tom Okker / 
Marty Riessen 
