in 1977). Nevertheless, Vilas was rated number one by World Tennis, France Presse, Tennis de France, Le Livre d'or du Tennis, Gene Scott, Peter Bodo, Christian Quidet, and Michael Sutter. The International Tennis Hall of Fame inscription for Vilas stated "it was generally considered Vilas was the real No. 1 for 1977". Vilas was also rated number one by Bud Collins and John Barrett by the 2010s. Argentine journalist Eduardo Puppo and Romanian mathematician Marian Ciulpan investigated the 1973–78 period records, and delivered a detailed report with more than 1,200 pages in which they came to the conclusion that Vilas should have been ranked No. 1 for five weeks in 1975 as well as during the first two weeks of 1976 and handed over their research to the ATP at the end of 2014. Although the study was not refuted, in May 2015 the ATP announced it had decided not to make official the No. 1 position for Vilas because it happened in the interval between the publications of the official rankings. In October 2020, Netflix released a documentary about the controversy titled "Guillermo Vilas: Settling the Score". It also covered (briefly) Evonne Goolagong Cawley's recognition as world no. 1 (for two weeks in 1976) retrospectively by the WTA in 2007. Retirement Vilas retired from the ATP Tour in 1989 but still played on the ATP Challenger Series until 1992. He was inducted into the International Tennis Hall of Fame in 1991. Vilas was in the stands at Flushing Meadows to cheer on his countryman, Juan Martín del Potro, who beat Roger Federer in an upset in the 2009 US Open final. Family Vilas married Phiangphathu Khumueang in 2005. They have three daughters and one son. They reside in Monaco. He is reportedly suffering from a form of dementia. Distinctions Won the Grand Prix circuit in 1974, 1975, and 1977. World Tennis Magazine, France Presse, Michel Sutter and Christian Quidet, among others, ranked him as No. 1 Tennis Player of the Year in 1977. Held the Open Era male record for the longest winning streak on clay courts at 53 matches, set in 1977, until it was bettered by Rafael Nadal in 2006. Nadal later extended this to 81 matches. Won 62 ATP singles titles (eighth highest during the Open Era) and was the runner-up in 40 singles tournaments (plus two unfinished finals). Won 16 doubles titles with other 10