Guillermo Vilas, also known as Willy Vilas, is an Argentine former professional tennis player, No. 1 of the Grand Prix seasons in 1974, 1975 and 1977, who won four Grand Slam tournaments, one year-end Masters, nine Grand Prix Super Series titles and 62 total ATP titles. World Tennis, Agence France-Presse and Livre d'or du tennis 1977, among other rankings and publications, rated him as world No. 1 in 1977. In the ATP computer rankings, he peaked at No. 2 in April 1975, a position that he held for a total of 83 weeks. He was inducted into the International Tennis Hall of Fame in 1991, two years after his first retirement.
First-seeded Björn Borg defeated defending champion Guillermo Vilas 6–1, 6–1, 6–3 in the final to win the Men's Singles tennis title at the 1978 French Open. Borg did not lose a single set in the event, and only 32 games in total, which remains a record in the history of the tournament. The tournament also featured the first Grand Slam tournament appearance of Ivan Lendl.
The 1974 South American Championships was a men's tennis tournament for male players that was part of the 1974 Commercial Union Assurance Grand Prix. It was played in Buenos Aires, Argentina, and held from 18 November through 24 November 1974. First-seeded Guillermo Vilas won the singles title.
The 1975 ATP Buenos Aires was a Grand Prix tennis circuit tournament held in Buenos Aires, Argentina and was held from 10 November through 16 November 1975. Guillermo Vilas won the singles title.
The 1976 South American Championships was a men's tennis tournament played on outdoor clay courts in Buenos Aires, Argentina that was part of the 1976 Commercial Union Assurance Grand Prix and held from 22 November through 28 November 1976. First-seeded Guillermo Vilas won the singles title.
The first 1977 ATP Buenos Aires, also known as the River Plate Championships, was an Association of Tennis Professionals men's tennis tournament that was played on outdoor clay courts at the Buenos Aires Lawn Tennis Club in Buenos Aires, Argentina and held from 14 April through 17 April 1977. First-seeded Guillermo Vilas won the singles title.
The second 1977 ATP Buenos Aires was a men's tennis tournament held in Buenos Aires, Argentina that was part of the Grand Prix circuit and played on outdoor clay courts. It was the 11th edition of the tournament and was held from 21 November through 27 November 1977. First-seeded Guillermo Vilas won the singles title.
The 1979 ATP Buenos Aires was a men's Grand Prix tennis circuit tournament held in Buenos Aires, Argentina that was played on outdoor clay courts. It was the 13th edition of the tournament and was held from 19 November through 25 November 1979. Guillermo Vilas won the singles title.
The 1981 South American Championships was a men's tennis tournament held in Buenos Aires, Argentina. It was the 15th edition of the tournament and was played on outdoor clay courts. The tournament was part of the 1981 Volvo Grand Prix and started was held from 16 November until 22 November 1981. First-seeded Ivan Lendl won the singles title.
The 1982 Grand Prix la Serenisima, also known as the Buenos Aires Grand Prix, was an Association of Tennis Professionals men's tennis tournament held in Buenos Aires, Argentina and took place from 1 February through 7 February 1982. It was the 16th edition of the tournament and first-seeded Guillermo Vilas won the singles title.
The 1977 Colgate-Palmolive Grand Prix was a professional tennis circuit administered by the International Lawn Tennis Federation which served as a forerunner to the current Association of Tennis Professionals (ATP) World Tour and the Women's Tennis Association (WTA) Tour. The circuit consisted of the four modern Grand Slam tournaments and open tournaments recognised by the ILTF. The Colgate-Palmolive Masters is included in this calendar but did not count towards the Grand Prix ranking. Colgate-Palmolive was the new tour sponsor, taking over from Commercial Union. Guillermo Vilas won the Grand Prix circuit, having accumulated the most points (2,047), and received the largest share from the bonus pool ($300,000). The top eight points ranked singles players as well as the top four doubles teams qualified for the season-ending Masters tournament
The 1975 Commercial Union Assurance Grand Prix was a professional tennis circuit administered by the International Lawn Tennis Federation (ILTF) which served as a forerunner to the current Association of Tennis Professionals (ATP) World Tour and the Women's Tennis Association (WTA) Tour. The circuit consisted of the four modern Grand Slam tournaments and open tournaments recognised by the ILTF. The Commercial Union Assurance Masters, Davis Cup Final and Nations Cup are included in this calendar but did not count towards the Grand Prix.
The 1974 Commercial Union Assurance Grand Prix was a professional tennis circuit administered by the International Lawn Tennis Federation (ILTF) which served as a forerunner to the current Association of Tennis Professionals (ATP) World Tour and the Women's Tennis Association (WTA) Tour. The circuit consisted of the four modern Grand Slam tournaments and open tournaments recognised by the ILTF. The season-ending Commercial Union Assurance Masters and Davis Cup Final are included in this calendar but did not count towards the Grand Prix ranking.
The 1975 Torneo Godó or Trofeo Conde de Godó was a combined men's and women's tennis tournament that took place on outdoor clay courts in Barcelona, Spain. It was the 23rd edition of the tournament and the men's events were part of the 1975 Grand Prix circuit. It was held from 13 October until 19 October 1975. Björn Borg won the singles title.
The 1980 Monte Carlo Open was a men's tennis tournament played on outdoor clay courts at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France that was part of the 1980 Volvo Grand Prix circuit. It was the 74th edition of the tournament and was held from 31 March through 6 April 1980. First-seeded Björn Borg won the singles title, his third after 1977 and 1979.
The 1974 Aryamehr Cup was a men's professional tennis tournament played on outdoor clay courts at the Imperial Country Club in Tehran in Iran. The event was part of the 1974 Commercial Union Assurance Grand Prix as a Group AA category event. It was the third edition of the tournament was held from 21 October through 27 October 1974. Guillermo Vilas won the singles title and the trophy was presented by Shah Mohammad Reza Pahlavi.
The 1974 Italian Open was a combined men's and women's tennis tournament that was played by men on outdoor clay courts at the Foro Italico in Rome, Italy. The men's tournament was part of the 1974 Commercial Union Assurance Grand Prix circuit while the women's tournament was part of the Women's International Grand Prix circuit. The tournament was held from 26 May through 3 June 1974. The singles titles were won by third-seeded Björn Borg and first-seeded Chris Evert.
The 1975 U.S. Pro Tennis Championships was a men's tennis tournament played on outdoor green clay courts (Har-Tru) at the Longwood Cricket Club in Boston, USA. It was classified as a Group AA category tournament and was part of the 1975 Grand Prix circuit. It was the 48th edition of the tournament and was held from August 19 through August 25, 1975. Second-seeded and defending champion Björn Borg won the singles title and the accompanying $16,000 first prize money. The tournament started a day late due to rain.
The 1979 Richmond WCT, also known by its sponsored name United Virginia Bank Classic, was a men's tennis tournament played on indoor carpet courts in Richmond, Virginia, USA. The event was part WCT Tour which was incorporated into the 1979 Colgate-Palmolive Grand Prix circuit. It was the ninth edition of the tournament and was held from January 29 through February 4, 1979. First-seeded Björn Borg won the singles title.
The 1977 Nice International Championships, was a men's tennis tournament played on outdoor clay courts at the Nice Lawn Tennis Club in Nice, France, and was part of the 1977 Colgate-Palmolive Grand Prix. It was the sixth edition of the tournament and was held from 28 March until 3 April 1977. First-seeded Björn Borg won the title.
Guillermo Vilas [1] 
