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

Context paragraphs:
1984 Volvo Masters: The 1984 Masters (also known as the 1984 Volvo Masters for sponsorship reasons) was a men's tennis tournament held in Madison Square Garden, New York City, United States between 8 January and 13 January 1985.  It was the year-end championship of the 1984 Volvo Grand Prix tour.

1982 Volvo Masters: The 1982 Masters (also known as the 1982 Volvo Masters for sponsorship reasons) was a men's tennis tournament held in Madison Square Garden, New York City, United States between 18–23 January 1983.  It was the year-end championship of the 1982 Volvo Grand Prix tour and was played on indoor carpet courts.  The round-robin format of previous editions was replaced by a knock-out tournament featuring the 12 highest ranking singles players as well as the six best doubles teams of the Grand Prix circuit.  The top four seeds in the singles event received a bye in the first round and all singles matches were played as best-of-three sets, except the final which was a best-of-five set match.

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.

1981 Italian Open (tennis): The 1981 Italian Open was a combined men's and women's tennis tournament that was played on outdoor clay courts.  For the second time in the history of the tournament the men and women competed in different locations.  The men's event was held at the traditional location of Foro Italico in Rome, while the women played in Perugia.  It was the 38th edition of the tournament.  The men's tournament was part of the 1981 Volvo Grand Prix while the women's tournament was part of the Toyota Series (Category 3).  The women's event was played from 4 May through 10 May 1981 while the men's event was organized from 18 May through 24 May 1981.  Third-seeded José Luis Clerc won the men's singles title and the accompanying $24,000 first-prize money.  The women's singles title was won by first-seeded Chris Evert-Lloyd, her fourth Italian Open title after 1974, 1975 and 1980.

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.

1980 Volvo Masters: The 1980 Masters (also known as the 1980 Volvo Masters for sponsorship reasons) was a men's tennis tournament held in Madison Square Garden, New York City, United States between 14–18 January 1981.  It was the year-end championship of the 1980 Volvo Grand Prix tour.

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.

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.

1981 Stockholm Open: The 1981 Stockholm Open was a men's tennis tournament played on hard courts and part of the 1981 Volvo Grand Prix and took place in Stockholm, Sweden.  The tournament was held from 2 November through 8 November 1981.  Third seeded Gene Mayer won the singles title after a victory in the final against his brother Sandy.

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.

Supporting paragraphs: 1981 Volvo Masters – Singles Vitas Gerulaitis
Answer: Ivan Lendl