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.
Guillermo Vilas defeated John Marks in the final, 6–4, 6–4, 3–6, 6–3 to win the men's singles tennis title at the 1978 Australian Open.
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 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 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 1981 Volvo International was a men's tennis tournament played on outdoor clay courts in North Conway, New Hampshire in the United States and was part of the 1981 Volvo Grand Prix. The tournament ran from July 28 through August 3, 1981. José Luis Clerc won the singles title.
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 1977 Aryamehr Cup was a men's professional tennis tournament played on outdoor clay courts in Tehran in Iran. The event was part of the 1977 Colgate-Palmolive Grand Prix as a Five Star category event. It was the sixth and final edition of the tournament and was held from 3 October through 9 October 1977. Guillermo Vilas won the singles title.
The 1979 U.S. Clay Court Championships was a men's Grand Prix and women's Colgate Series tennis tournament. The event was held for the first time at the newly built Indianapolis Sports Center in Indianapolis in the United States and played on outdoor clay courts. It was the 11th edition of the tournament in the Open Era and was held in from August 6 through August 12, 1979. First-seeded Jimmy Connors won the men's singles title and the $25,000 first-prize money. First-seeded Chris Evert-Lloyd claimed the women's singles title and $20,000 first-prize money.
The 1978 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 Chestnut Hill, Massachusetts in the United States. The event was part of the 1978 Grand Prix circuit. It was the 51st edition of the tournament and was held from August 21 through August 28, 1978. Despite pressure to switch to a hard court surface from the Association of Tennis Professionals (ATP) and some leading players, in line with the surface change made that year by the US Open which directly followed the Boston event, the tournament organization elected to remain a clay court tournament in 1978. Several top players including Björn Borg, Guillermo Vilas and Jimmy Connors elected not to play the tournament. Fourth-seeded and defending champion Manuel Orantes won the singles title and the accompanying $32,000 first-prize money. The final was delayed until Tuesday, August 29 due to rain.
The 1979 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 36th edition of the tournament. The men's tournament was part of the 1979 Colgate-Palmolive Grand Prix while the women's tournament, held separately for the first time, was part of the Colgate Series. The women's event was played from 7 May through 13 May 1979 while the men's event was organized from 21 May through 27 May 1979. After a final that lasted five hours and nine minutes second-seeded Vitas Gerulaitis won the men's singles title, his second Italian Open title after 1977, and the accompanying $28,000 first-prize money. The women's singles title was won by third-seeded Tracy Austin. In the semifinal Austin defeated compatriot Chris Evert-Lloyd which ended Evert-Lloyd's record 125-match winning streak on clay that had started in August 1973.
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 Mutual Benefit Life Open, also known as the South Orange Open, was a men's tennis tournament played on outdoor clay courts at the Orange Lawn Tennis Club in South Orange, New Jersey in the United States. It was classified as a Two Star category tournament and was part of the 1977 Grand Prix circuit. It was the eight edition of the tournament on the Grand Prix circuit and was held from July 31 through August 8, 1977. First-seeded Guillermo Vilas won the singles title.
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 in the United States. The event was part WCT Tour which was incorporated into the 1979 Colgate-Palmolive Grand Prix circuit. It was the 14th edition of the tournament and was held from January 29 through February 4, 1979. First-seeded Björn Borg won the singles title.
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 1981 Washington Star International was a men's tennis tournament and was played on outdoor clay courts. The event was part of the 1981 Grand Prix circuit. It was the 13th edition of the tournament and was held at Rock Creek Park in Washington, D.C. from July 20 through July 26, 1981. Third-seeded José Luis Clerc won the singles title.
The 1982 Swiss Open was a men's tennis tournament played on outdoor clay courts in Gstaad, Switzerland that was part of the 1982 Volvo Grand Prix tennis circuit. It was the 36th edition of the tournament and was held from 5 July through 11 July 1982. Second-seeded José Luis Clerc won the singles title.
The 1979 Mutual Benefit Life Open, also known as the South Orange Open, was a men's tennis tournament played on outdoor clay courts at the Orange Lawn Tennis Club in South Orange, New Jersey in the United States. The event was part of the 1979 Grand Prix circuit. It was the tenth edition of the tournament and was held from July 30 through August 5, 1979. First-seeded John McEnroe won the singles title and earned $13,000 first-prize money.
The 1980 Mutual Benefit Life Open, also known as the South Orange Open, was a men's tennis tournament played on outdoor clay courts at the Orange Lawn Tennis Club in South Orange, New Jersey in the United States. The event was part of the 1980 Grand Prix circuit. It was the 11th edition of the tournament and was held from July 28 through August 4, 1980. Second-seeded José Luis Clerc won the singles title and earned $15,000 first-prize money.
Guillermo Vilas [1] 
John McEnroe / 