Question: In the 1981 Volvo Masters who beat the winner of the 1975 Wimbledon men's double that partnered with Sandy Mayer?

full_context: Document 1: Edberg–Lendl rivalry: The tennis players Stefan Edberg (Sweden) and Ivan Lendl (Czechoslovakia, 1978–92/United States, 1992–94) met 27 times during their careers. Edberg leads the series 14–13. In an interview with the ATP in 2008 Edberg reflected on his classic rivalries.
Document 2: 1981 Volvo Masters: The 1981 Masters (also known as the 1981 Volvo Masters for sponsorship reasons) was a men's tennis tournament held in Madison Square Garden, New York City, United States between 13–17 January 1982. It was the year-end championship of the 1981 Volvo Grand Prix tour.
Document 3: Vitas Gerulaitis: Vytautas Kevin Gerulaitis (July 26, 1954 – September 17, 1994) was an American professional tennis player. In 1975, Gerulaitis won the men's doubles title at Wimbledon, partnering with Sandy Mayer. He won the men's singles title at one of the two Australian Open tournaments held in 1977 (Gerulaitis won the tournament that was held in December, while Roscoe Tanner won the earlier January tournament). Gerulaitis also won two Italian Open titles, in 1977 and 1979, and the WCT Finals in Dallas, in 1978.
Document 4: 1981 Volvo International: 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.
Document 5: 1981 Volvo Masters – Singles: Björn Borg was the defending champion, but did not participate. Ivan Lendl won in the final 6–7(5), 2–6, 7–6(6), 6–2, 6–4 against Vitas Gerulaitis.
Document 6: 1968 US Open (tennis): The 1968 US Open (formerly known as U.S. National Championships) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York, United States. The tournament ran from 29 August until 8 September. It was the 88th staging of the tournament and the fourth Grand Slam event of 1968. It was the first edition of the tournament in the Open Era of tennis and as such for the first time offered prize money, totaling $100,000. Arthur Ashe and Virginia Wade won the singles titles. Ashe was still registered as an amateur and therefore not entitled to the $14,000 first-prize money, which instead went to runner-up Tom Okker, while Wade earned $6,000. Frank Parker, at the age of 52, lost to eventual champion Arthur Ashe in the second round, and still holds the record for the oldest man to compete in a Grand Slam singles tournament.
Document 7: 1987 US Open – Men's Singles: Ivan Lendl was the two time defending champion and retained his title again, defeating Mats Wilander 6–7, 6–0, 7–6, 6–4 in the final to win the Men's Singles tennis title at the 1987 US Open. It was also the 6th consecutive US Open final of Lendl's record 8 consecutive US Open finals.
Document 8: 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.
Document 9: Ernests Gulbis: Ernests Gulbis (] , born 30 August 1988, and nicknamed "The Gull" or "Ernie") is a Latvian professional tennis player. In 2008, Gulbis won his first ATP Tour doubles title at the U.S. Men's Clay Court Championships, teaming with Rainer Schüttler, and in 2010 won his first ATP Tour singles title in the Delray Beach, defeating Ivo Karlović in the final. In total, Gulbis has 6 ATP titles to his name and has never lost a final. His best performance at a Grand Slam is reaching the semifinals of the 2014 French Open. He had previously reached the quarterfinals of the 2008 French Open. Gulbis' career-high singles ranking is world No. 10, making him the only Latvian tennis player ever to be ranked inside the top 10 in ATP Singles Ranking. He achieved this in June 2014.
Document 10: 1985 Wimbledon Championships – Men's Singles: John McEnroe was the defending champion but lost in the quarterfinals to Kevin Curren. Curren also defeated Jimmy Connors in the semifinal and became the first player ever to defeat both Connors and McEnroe in the same Grand Slam tournament.
Document 11: Ken Flach: Kenneth Eliot Flach (born May 24, 1963) is a former professional tennis player from the United States. A doubles specialist, he won 4 Grand Slam men's doubles titles (2 Wimbledon and 2 US Open), and 2 Grand Slam mixed doubles titles (1 Wimbledon and 1 French Open). He also won the men's doubles Gold Medal at the 1988 Olympic Games in Seoul, partnering Robert Seguso. Flach reached the World No. 1 doubles ranking in 1985.
Document 12: Arthur Ashe: Arthur Robert Ashe Jr. (July 10, 1943 – February 6, 1993) was an American professional tennis player. He won three Grand Slam titles.
Document 13: 1981 US Open – Men's Singles: John McEnroe was the two time defending champion and retained his title again, defeating Björn Borg 4–6, 6–2, 6–4, 6–3 in the final to win the Men's Singles tennis title at the 1981 US Open in a repeat of the previous years final, and which turned out to be Borg's final grand slam match.
Document 14: Mats Wilander: Mats Wilander (] ; born 22 August 1964) is a former World No. 1 tennis player from Sweden. From 1982 to 1988, he won seven Grand Slam singles titles (three at the French Open, three at the Australian Open, and one at the US Open), and one Grand Slam men's doubles title (at Wimbledon).
Document 15: 1981 World Championship Tennis Finals: The 1981 World Championship Tennis Finals was a men's tennis tournament played on indoor carpet courts. It was the 11th edition of the WCT Finals and was part of the 1981 Volvo Grand Prix. The tournament was played at the Reunion Arena in Dallas, Texas in the United States and was held from April 27 through May 3, 1981. The winners of the eight WCT tournaments that were part of the 1981 Grand Prix circuit qualified for the tournament augmented by the next best performers in the WCT points standings. Guillermo Vilas qualified by winning the last tournament held just before the WCT Finals, the River Oaks Tournament in Houston, but was unavailable to play. Jimmy Connors withdrew before the tournament due to gastroenteritis and Yannick Noah could not participate due to a shoulder injury. They were replaced by Sandy Mayer and Sam Giammalva respectively. John McEnroe won the title and $100,000 prize money.
ground_truth: Ivan Lendl