Guillermo 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.
The 1973 South American Open, also known as the Argentine Open, was a men's tennis tournament that was played on outdoor clay courts in Buenos Aires, Argentina. The event was part of the 1973 Commercial Union Assurance Grand Prix circuit, categorized as Group B, and was held from 19 November through 25 November 1973. Guillermo Vilas won the singles title after first-seeded Björn Borg had to retire in the final after injuring his hand when he ran into the umpire's stand. He earned $7,000 first-prize money.
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 1978 Romika Cup was a men's Grand Prix Tennis Circuit tournament held in Munich, West Germany. It was the 62nd edition of the tournament and was held from 23 May through 28 May 1978. It is now part of the ATP Tour. First-seeded Guillermo Vilas won the singles title, his second after 1975.
The 1977 American Airlines Tennis Games was a men's tennis tournament played on outdoor hard courts. It was the 4th edition of the Indian Wells Masters and was part of the 1977 Colgate-Palmolive Grand Prix. It was played at the Mission Hills Country Club in Rancho Mirage, California in the United States from February 21 through February 27, 1977. Brian Gottfried 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 1977 South African Open, also known by its sponsored name SAB Open, was a combined men's and women's tennis tournament played on outdoor hard courts in Johannesburg, South Africa. The men's tournament was part of the 1977 Colgate-Palmolive Grand Prix while the women's event was part of the 1977–1978 Colgate International Series. It was the 74th edition of the tournament and was held from 28 November through 6 December 1977. Guillermo Vilas and Linky Boshoff won the singles titles.
The 1974 Suisse Open Gstaad was a men's tennis tournament played on outdoor clay courts in Gstaad, Switzerland. It was the 29th edition of the tournament and was held from 8 July through 14 July 1974. The tournament was part of the Grand Prix tennis circuit and categorized in Group B. Guillermo Vilas won the singles title and the accompanying $8,000 prize money.
The 1974 Louisville Open, also known as the First National Tennis Classic, was a men's tennis tournament played on outdoor clay courts at the Louisville Tennis Center in Louisville, Kentucky, USA. It was the fifth edition of the tournament and was held from 29 July through 5 August 1974. The tournament was part of the Grand Prix tennis circuit and categorized in Group AA. The singles final was won by tenth-seeded Guillermo Vilas who received the $16,000 first prize money and 80 Grand Prix points.
The 1977 New South Wales Open, also known by its sponsored name Marlboro New South Wales Open, was a combined men's and women's tennis tournament played on outdoor grass courts at the White City Stadium in Sydney, Australia. The men's was part of the 1977 Colgate-Palmolive Grand Prix circuit. It was the 85th edition of the event and was held from 12 December through 18 January 1977. The singles titles were won by Evonne Goolagong Cawley and Roscoe Tanner. Defending champion Tony Roche was unable to participate due to a stomach muscle injury.
The 1977 Washington Star International was a men's tennis tournament and was played on outdoor clay courts in Washington, D.C., USA. It was part of the 1977 Grand Prix circuit and categorized as a 4 star event. It was the 9th edition of the tournament and was held in Washington, D.C. from July 18 through July 25, 1977. First-seeded Guillermo Vilas won the singles title, his second after 1975, and earned the $20,000 first-prize money. The singles final was delayed for two hours due to rain.
The 1977 Louisville Open, also known as the Louisville International Tennis Classic, was a men's tennis tournament played on outdoor clay courts at the Louisville Tennis Center in Louisville, Kentucky, United States. It was the eighth edition of the tournament and was held from 25 July through August 1, 1977. The tournament was part of the Grand Prix tennis circuit and categorized as a Four Star event. The singles final was won by first-seeded Guillermo Vilas who received $20,000 first prize money. It was Vilas' third title win at the tournament after 1974 and 1975.
The 1978 Suisse Open Gstaad was a men's tennis tournament played on outdoor clay courts in Gstaad, Switzerland. It was the 33rd edition of the tournament and was held from 10 July through 16 July 1978. The tournament was part of the Grand Prix tennis circuit with a total prize money available of $75,000. First-seeded Guillermo Vilas won the singles title, his second at the tournament after 1974.
The 1977 Austrian Open , also known as the 1977 Head Cup for sponsorship reasons, was a men's tennis tournament played on outdoor clay courts. It was categorized as a two-star tournament and was part of the Colgate-Palmolive Grand Prix circuit. It took place at the Tennis Stadium Kitzbühel in Kitzbühel, Austria and was held from 11 July through 17 July 1977. Guillermo Vilas won the singles title after a final that lasted 4 hours and 45 minutes.
The 1979 Washington Star International was a men's tennis tournament and was played on outdoor clay courts. The event was part of the 1979 Grand Prix circuit. It was the 11th edition of the tournament and was held at Rock Creek Park in Washington, D.C. from July 16 through July 22, 1979. First-seeded Guillermo Vilas won the singles title, his third at the event after 1975 and 1977.
The 1978 German Open was a combined men's and women's tennis tournament played on outdoor red clay courts. The men's tournament was part of the 1978 Colgate-Palmolive Grand Prix circuit, categorized as a four-star event, while the women's tournament was part of the Colgate Series and classified as an A category event. It was the 70th edition of the tournament and took place at the Am Rothenbaum in Hamburg, West Germany, from 15 May through 21 May 1978. Guillermo Vilas and Mima Jaušovec, both first-seeded, won the singles titles.
The 1977 Raquette d'Or was a men's tennis tournament staged in Aix-en-Provence, France that was part of the One star category of the 1977 Grand Prix circuit. The tournament was played on outdoor clay courts and was held from 26 September until 2 October 1977. It was the inaugural edition of the tournament. Ilie Năstase won the singles title. In a five-set final against Guillermo Vilas he had won the first two sets when Vilas retired in protest of Năstase's use of a spaghetti strung racquet.
The 1977 Chilean International was a men's tennis tournament played on outdoor clay courts in Santiago, Chile. It was the second edition of the tournament and was held from 14 November through 20 November 1977. The tournament was part of the 1 Star tier of the Grand Prix tennis circuit. First-seeded Guillermo Vilas won the singles title.
The 1977 Orient Cup was a men's tennis tournament played on outdoor clay courts in Bogotá, Colombia that was part of the one star category of the 1977 Colgate-Palmolive Grand Prix. It was the inaugural edition of the tournament and was held from 7 November through 13 November 1977. First-seeded Guillermo Vilas won the singles title.
The 1981 Egyptian Open was a men's tennis tournament played on outdoor clay courts that was part of the 1981 Volvo Grand Prix circuit. It was the fifth edition of the tournament and was played in Cairo, Egypt from 9 March until 15 March 1981. First-seeded Guillermo Vilas won the singles title.
Guillermo Vilas [1] 
Colin Dibley / 
Wojciech Fibak [2] 
