Question: What is the website that is an offshoot of the magazine which, in 2005, ranked Guillermo Vilas as the 15th-best male player of the preceding 40 years

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1977 ATP Buenos Aires (April) – Singles: Guillermo Vilas defeated Wojtek Fibak 6-4, 6-3, 6-0 to win the April 1977 ATP Buenos Aires singles competition.  Vilas was the defending champion.

1975 ATP Buenos Aires – Singles: Guillermo Vilas defeated Adriano Panatta 6-1, 6-4, 6-4 to win the 1975 ATP Buenos Aires singles competition.  Vilas was the defending champion.

Kim Warwick: Kim Warwick (born 8 April 1952) is an Australian former professional male tennis player who competed on the ATP Tour from 1970–1987 reaching the final of the singles Australian Open in 1980.  He defeated over 35 players ranked in the top 10 including Guillermo Vilas, Raul Ramerez, Vitas Gerulaitis, Jan Kodeš, Bob Lutz and Arthur Ashe.  Warwick's career-high singles ranking was World No. 15, achieved in 1981.  He won three singles titles and 26 doubles, including Australian Open 1978 (with Wojtek Fibak) and Australian Open 1980 and 1981, Roland Garros 1986 and also a runner-up in Australian Open 1985, all of them partnering fellow countryman Mark Edmondson.  Partnering with Evonne Goolagong, he won the French Open 1972, defeating Françoise Dürr and Jean-Claude Barclay in the final 6–2, 6–4.  Evonne and Kim were finalists in 1972 at Wimbledon against Rosie Casals and Ilie Năstase who won 6–4, 6–4.

Tennis (magazine): TENNIS is an American sports magazine owned by the Sinclair Broadcast Group.  There are eight issues per year covering the world of tennis.  The "tennis.com" website is an offshoot of the magazine and part of the same media company.

Guillermo Cañas: Guillermo Ignacio Cañas (born November 25, 1977), often referred to as Willy Cañas, is a retired Argentine professional tennis player.  He was born in Argentina's capital, Buenos Aires, and named after Argentine tennis star Guillermo Vilas.  His career-high singles ranking was World No. 8, achieved in June 2005.  Cañas was the coach of Ernests Gulbis from July 2011 until May 2012 and became the coach of Teymuraz Gabashvili in 2015.  Since January 2017, he is coaching former #1, Jelena Jankovic.

Guillermo Vilas: Guillermo Vilas (] ; born 17 August 1952) is a retired professional tennis player from Argentina, N°1 of the Grand Prix tennis circuit's Season in 1974, 1975 and 1977, who won four majors, seven Grand Prix Super Series titles and 62 ATP titles.  He was inducted into the International Tennis Hall of Fame in 1991.  Known for his prolific match play, especially on clay, he became the second man to win more than 900 matches in the Open Era, and his number of match wins on clay are by far the most of the Era.  His peak was the 1977 season during which he won two major titles (both on clay), had two long match win streaks of 46 all-surface and 53 on clay, and finished with an Open Era record of match wins.  In 2005, Tennis magazine ranked him as the 15th-best male player of the preceding 40 years.  He also popularized the between-the-legs tweener shot, also known as the "Gran Willy" in his honor.

1977 ATP Buenos Aires (November) – Singles: Guillermo Vilas defeated Jaime Fillol Sr. 6-2, 7-5, 3-6, 6-3 to win the November 1977 ATP Buenos Aires singles competition.  Vilas was the defending champion.

1977 Louisville Open: 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, USA.  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.

Roy Emerson: Roy Stanley Emerson (born 3 November 1936) is an Australian former World number one tennis player who won 12 Major singles titles and 16 Grand Slam tournament men's doubles titles.  He is the only male player to have completed a Career Grand Slam (winning titles at all four Grand Slam events) in both singles and doubles.  His 28 major titles are an all-time record for a male amateur player.  Emerson is the first male player to win each amateur major title at least twice in his career.  He is one of only eight men to win all four majors in his career.  He was the first male player to win 12 majors.  Along with Novak Djokovic, he is one of only two male players to win six Australian Championships.  He won five of them consecutively (1963–67).  His 12 wins have since been surpassed.  Emerson is one of only five tennis players all-time to win multiple slam sets in two disciplines, only matched by Margaret Court, Martina Navratilova, Frank Sedgman and Serena Williams.

2004 French Open: The 2004 French Open was the 103rd edition of the tournament.  Gastón Gaudio became the first men's Open Era Grand Slam title winner to save match points (2) in the final; the last time that had happened was 70 years earlier.  Gaudio also became the first Argentine man since Guillermo Vilas to win a grand slam, in 1979.  Fellow Argentine Guillermo Coria, widely regarded as the favourite and best clay court player in the world coming into the tournament, was seeded 3rd for the event, whereas Gaudio was unseeded (ranked 44th) and with only two titles to his name, both of which he had won over two years before.  After winning the first two sets convincingly, Coria began suffering from leg cramps. Gaudio won the next two sets; however, Coria came back and was up two breaks of serve in the final set.  Coria had two match points at 6–5 before Gaudio prevailed 0–6, 3–6, 6–4, 6–1, 8–6.  Gaudio also became the first man to win a Grand Slam tournament final after being bagelled in the first set.  The tournament was noted for the excellent performance of the Argentine players – in addition to the two finalists, there were a semifinalist (David Nalbandian) and a quarterfinalist (Juan Ignacio Chela).  It was also highlighted by a first round match between Fabrice Santoro and Arnaud Clément, lasting 6 hours and 33 minutes and ending in Clement's defeat 6–4, 6–3, 6–7, 3–6, 16–14, setting a new record for the longest singles match in the open era, which would stand until Wimbledon 2010.  It was also the last Grand Slam tournament to feature neither Roger Federer nor Rafael Nadal in the semi-finals until the 2012 US Open.

Supporting paragraphs: Guillermo Vilas Tennis (magazine)
Answer: "tennis.com"