Question: Who is younger, Yevgeny Kafelnikov or Allan Stone?

full_context: Document 1: Allan Stone: Allan Stone (born 14 October 1945) played amateur and professional tennis in the 1960s and 1970s. He was ranked as high as World No. 38 in singles on the ATP Rankings in April 1975.
Document 2: Yevgeny Kafelnikov: Yevgeny Aleksandrovich Kafelnikov (Russian: Евгений Александрович Кафельников ] ; born 18 February 1974) is a Russian former world No. 1 tennis player. He won two Grand Slam singles titles, the 1996 French Open and the 1999 Australian Open. He also won four Grand Slam doubles titles, being the last man to have won both the men's singles and doubles titles at the same Grand Slam tournament, which he did at the 1996 French Open.
Document 3: Gonzales–Rosewall rivalry: American tennis player Pancho Gonzales had a long-running rivalry with Australian Ken Rosewall. Gonzales is still sometimes considered to be a candidate for the greatest tennis player of all time; he was the dominant player of the 1950s and still holds the men's all-time record of being ranked world No. 1 for eight years. Rosewall became the world's best player upon Gonzales's semi-retirement in 1961 and held that position either by himself or sharing it with others for six years. Rosewall was signed in 1956 by the promoter Jack Kramer, a former #1 player himself, to join his small band of touring professionals in 1957. He then engaged in a round-the-world, head-to-head tour against Gonzales, the defending world's champion, over the next five months, winning 26 matches but losing 50. In his 1979 autobiography Kramer included both Gonzales and Rosewall in his list of the 21 greatest players of all time. Kramer, however, initially "panicked" upon signing Rosewall.He was a cute little fellow with a dink serve, who operated mostly from the baseline. That great volley of his hadn't been developed yet. I was afraid that Gorgo would eat him alive and put us out of business the rest of the way. But like a lot of people I completely underestimated Rosewall. Before their opening match in Melbourne, Kramer went to Gonzales and asked him to "carry" Rosewall, giving him a better share of the gate to gain his assent. Gonzales did try to carry out his part of the deal for a few matches, but then called it off, telling Kramer that he was no longer able to play his normal game. Kramer agreed. "It was... obvious that Rosewall was not the pushover I had feared. (In fact, Gonzales only beat him 50–26, and it was always competitive.)" Six years older than Rosewall, 13 years later, in 1970, Gonzales defeated him in 6–4, 6–4, in the 199th and next-to-last match they ever played—Gonzales was 42 years old at the time and Rosewall was considered to be the co-No. 1 player in the world.
Document 4: Ken Rosewall: Kenneth Robert Rosewall {'1': ", '2': ", '3': 'AM, MBE', '4': "} (born 2 November 1934) is a former world top-ranking amateur and professional tennis player from Australia. He won a record 23 tennis Majors including 8 Grand Slam singles titles and before the Open Era a record 15 Pro Slam titles and a record 35 Major finals overall. He won the Pro Grand Slam in 1963. Rosewall won 9 slams in doubles with a career double grand slam. He is considered to be one of the greatest tennis players of all time. He had a renowned backhand and enjoyed a long career at the highest levels from the early 1950s to the early 1970s. Rosewall was one of the two best male players for about nine years and was the World No. 1 player for a number of years in the early 1960s. He was ranked among the top 20 players, amateur or professional, every year from 1952 through 1977. Rosewall is the only player to have simultaneously held Pro Grand Slam titles on three different surfaces (1962–1963). At the 1971 Australian Open he became the first male player during the open era to win a Grand Slam tournament without dropping a set.
Document 5: Marty Riessen: Marty Riessen (born December 4, 1941) played amateur and professional tennis in the 1960s and 1970s. He was ranked as high as No. 11 in the world in singles on the ATP Rankings in September 1974, though was ranked as high as World No. 8 by Lance Tingay of The Daily Telegraph in 1971, before the computer rankings. Renowned for his doubles play, Riessen was also a regular doubles partner of Australian tennis great Margaret Court, winning six of his seven major mixed titles and a career grand slam alongside her. Additionally a winner of two men's doubles grand slams, his highest doubles ranking was No. 3 on March 3, 1980.
Document 6: Stefan Edberg: Stefan Bengt Edberg (] ; born 19 January 1966) is a Swedish former world no. 1 professional tennis player (in both singles and doubles). A major proponent of the serve-and-volley style of tennis, he won six Grand Slam singles titles and three Grand Slam men's doubles titles between 1985 and 1996. He also won the Masters Grand Prix and was a part of the Swedish Davis Cup-winning-team four times. In addition he won four Masters Series titles, four Championship Series titles and the unofficial Olympic tournament 1984, was ranked in the singles top 10 for ten successive years, 9 years in the top 5, and is considered one of the greatest players of his era. Edberg began coaching Roger Federer in January 2014, with this partnership ending in December 2015.
Document 7: 1999 Australian Open – Men's Singles: Petr Korda was the defending champion, but he was eliminated in the third round by Todd Martin.<br>Yevgeny Kafelnikov won the title, defeating Thomas Enqvist in the final, 4–6, 6–0, 6–3, 7–6. With this win, Kafelnikov became the first Russian (male or female) to win the Australian Open.
Document 8: Evgeny Korolev: Evgeny Evgenyevich Korolev (Russian: Евге́ний Евге́ньевич Королёв ; born 14 February 1988) is Kazakhstani tennis player and the cousin of former Russian player Anna Kournikova. He began playing tennis at age four with his father, and picked up his first ATP points at age 15 in three German challenger events. He can speak Russian, German, English and Spanish.
Document 9: Gene Stone: After graduating from Stanford and getting his masters in English Literature from Harvard, Stone (b. 1951) joined the Peace Corps, where he spent two years in the Republic of Niger. Returning to his home state of New York, he then started a career as an editor. He began at Harcourt Brace, where he edited a wide range of books, including Patricia Bosworth’s biography of Montgomery Clift. He then worked at Bantam Books, where he helped launch its hardcover division by acquiring such books as Albert Goldman’s biography of John Lennon and Kareem Abdul-Jabbar’s autobiography. Next, he worked as a senior editor at "Esquire Magazine", editing authors ranging from Alan Furst and Bobbie Ann Mason to Michael Kinsley and Joel Kotkin. He then moved to Los Angeles, where he was West Coast editor of Simon and Schuster, a consulting editor at the "Los Angeles Times", and editor in chief of "California Magazine".
Document 10: 1996 Estoril Open – Doubles: Yevgeny Kafelnikov and Andrei Olhovskiy were the defending champions but only Kafelnikov competed that year with Paul Haarhuis.
Document 11: Sandy Mayer: Alexander "Sandy" Mayer (born April 5, 1952) is a former tennis player from the United States, who won ten titles in singles and twenty-four titles in doubles during his professional career. He was part of the winning tennis squad at Stanford University in 1973.
Document 12: Jim Courier: James Spencer Courier Jr. (born August 17, 1970) is an American former World No. 1 professional tennis player. During his career, he won four Grand Slam singles titles, two at the French Open and two at the Australian Open. He holds the record for being the youngest man to have reached the finals of all four Grand Slam singles tournaments, at the age of 22 years and 11 months. He also won five Masters 1000 series titles. Until Novak Djokovic in 2016, Courier was the last man to win both the Australian and French Opens in the same calendar year.
Document 13: Rob Stone: Rob Stone is a sports commentator for Fox Sports. He has covered various sports including Major League Soccer, NCAA and NFL football, and ESPN's coverage of PBA Tournament Bowling alongside color commentator and PBA Hall of Famer Randy Pedersen.
Document 14: 2010 French Open – Legends Under 45 Doubles: Paul Haarhuis and Cédric Pioline were the defending champion, but Haarhuis did not play this year.Pioline partnered up with Arnaud Boetsch, but they were eliminated by Goran Ivanišević and Michael Stich in the round-robin stage.Yevgeny Kafelnikov and Andriy Medvedev won in the final 6–1, 6–1 against Ivanisevic and Stich.
Document 15: Yevgeny Kafelnikov: Yevgeny Aleksandrovich Kafelnikov (Russian: Евгений Александрович Кафельников ] ; born 18 February 1974) is a Russian former world No. 1 tennis player. He won two Grand Slam singles titles, the 1996 French Open and the 1999 Australian Open. He also won four Grand Slam doubles titles, being the last man to have won both the men's singles and doubles titles at the same Grand Slam tournament, which he did at the 1996 French Open.
ground_truth: Yevgeny Aleksandrovich Kafelnikov