Question: Who is younger, Thomaz Koch or Sherwood Stewart?

full_context: Document 1: Betty Stöve: Betty Stöve (born 24 June 1945) is a Dutch former professional tennis player. She is best remembered for reaching the ladies' singles final at Wimbledon in 1977. She also won ten Grand Slam titles in women's doubles and mixed doubles.
Document 2: Jonathan Stark (tennis): Jonathan Stark (born April 3, 1971) is a former professional tennis player from the United States. During his career he won two Grand Slam doubles titles (the 1994 French Open Men's Doubles and the 1995 Wimbledon Championships Mixed Doubles). Stark reached the World No. 1 doubles ranking in 1994.
Document 3: Carlos Fernandes (tennis): Carlos Fernandes (1936-) is a retired Brazilian tennis player. He had a good all-round game with excellent passing shots and moved fast around the court. Fernandes had a reputation for being a charismatic ladies man. He later became a coach. He made his Grand Slam debut at Wimbledon 1957, losing in the opening round to Jorgen Ulrich. At Roland Garros in 1958, Fernandes lost in round one to Pierre Darmon. At Wimbledon he lost in round one to Butch Buchholz. At 1959 French Open, Fernandes lost in round three to Jacques Brichant.At Wimbledon he lost in round two to Neale Fraser. At French Open 1960, Fernandes lost in round three to Bobby Wilson and at Wimbledon lost in round two to Wolfgang Stuck. At 1961 French Open, Fernandes achieved his best Grand Slam singles result by beating Pierre Darmon and Bob Hewitt before losing to Jan-Erik Lundquist in the quarter finals. He lost in round two of Wimbledon to Wilson. At Roland Garros 1962, Fernandes lost to Lundquist in round two. At Wimbledon he lost in round one to Neale Fraser's brother John. At 1963 French Open he lost in round one to Christian Duxin. In round one of Wimbledon he led a young Arthur Ashe by two sets to 0, but lost in five sets. At Wimbledon 1964 he lost in round two to Gene Scott. An ankle injury in 1964 took its' toll and Fernandes played less after that. As Open tennis arrived, Fernandes was reaching the end of his career. He lost in round one of 1968 French Open to Bernard Montrenaud. At Wimbledon he lost in round one to Mike Sangster.
Document 4: Tony Roche: Anthony Dalton Roche, AO MBE (born 17 May 1945) is a former professional Australian tennis player, native of Tarcutta. He played junior tennis in the New South Wales regional city of Wagga Wagga. He won one Grand Slam singles title and thirteen Grand Slam doubles titles, and was ranked as high as World No. 2 by Lance Tingay of "The Daily Telegraph" in 1969. He also coached multi-Grand Slam winning World No. 1s, Ivan Lendl, Patrick Rafter, Roger Federer, Lleyton Hewitt and former World No. 4, Jelena Dokic.
Document 5: 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 6: Fred McNair: Frederick V. McNair IV (born July 22, 1950 in Washington, D.C.) is a former professional tennis player from the United States who reached the World No. 1 doubles ranking in 1976. That year, he teamed up with Sherwood Stewart to capture the men's doubles titles at French Open, the German Open and the Masters. McNair was also a mixed doubles runner-up at the French Open in 1981, partnering Betty Stöve. In 1978, he was a member of the US team that won the Davis Cup. In nine years on the professional tour, McNair won 16 doubles titles. His career-high singles ranking was World No. 67.
Document 7: Thomas Emmrich: Thomas Emmrich (born 21 July 1953) is a former tennis player for East Germany. Between 1970 and 1988, Emmrich won 47 German Democratic Republic (GDR) titles (16 singles and 31 in the doubles and mixed). Unfortunately, he entered the tennis scene after the GDR had decided to promote only those sports which were relevant for the Olympics’ medals table. Thus, he was barred from international competitions outside the Eastern bloc countries and had to keep the status as an amateur. However, he gained some points at an ATP tournament in Sofia as GDR functionaries had not noticed that it had become part of the ATP tour. After this tournament, the ATP ranked him number 482—the only entry of a GDR tennis player in the ATP rankings.
Document 8: Sherwood Stewart: Sherwood Stewart (born June 6, 1946, in Goose Creek, Texas, United States) played amateur and professional tennis in the 1970s and 1980s. Stewart was ranked as high as No. 60 in the world in singles on the ATP Rankings on December 31, 1978, and No. 4 in doubles on January 3, 1983.
Document 9: Marcello del Bello: Marcello del Bello (born 25 January 1921) is a former Italian tennis player. He played Davis Cup and often played doubles with Giovanni Cucelli. Del Bello and his younger brother Rolando were introduced to the game at a young age, as their father worked at a tennis club. Both became tour players. Marcello made his Grand Slam debut at Wimbledon in 1947, losing in round one to Enrique Morea. At Roland Garros (held after Wimbledon for the last time), Del Bello lost in round three to Philippe Washer. At Roland Garros in 1948, Del Bello reached the quarter finals, where he lost to Budge Patty. At Wimbledon he lost to Frank Sedgman in round two. At Wimbledon 1949, Del Bello lost in round three to Nigel Cockburn. At the U. S. Championships, he lost in round two to James Brink. At Roland Garros in 1950, Del Bello lost in round three to Ken McGregor. By 1951 Del Bello's career was beginning to decline and he lost in round one of the French and Wimbledon. The following year he lost in round two at the French and Wimbledon. At Roland Garros in 1953, Del Bello lost in round one to Ian Ayre. In 1955, Del Bello turned professional.
Document 10: David Sherwood: David Sherwood is a tennis coach and former British tennis player. In his only live Davis Cup match, Sherwood played doubles with Andy Murray beating the Israeli World No 4 doubles team of Jonathan Erlich and Andy Ram,
Document 11: Mark L. Stewart: Mark L Stewart is an American writer and editor of magazines, books and web sites. He is best known for his books on sports, history and popular culture. Stewart was born on July 7, 1960 in New York City. He has published over 250 books, written nearly 1,500 athlete profiles in the print and electronic realm, and developed marketing and public relations materials for clients ranging from Denny's and Pizza Hut to Dick's Sporting Goods and Major League Soccer. Stewart is the managing editor of Edge Magazine and Radius Magazine, New Jersey lifestyle magazines with a combined annual circulation of 600,000 copies. Stewart is a principal of JockBio.com, a popular sports information site that posts full-length athlete biographies, and The Big Pitch television show on Fox Business Network.
Document 12: Gilbert Shea: Gilbert Shea (born 5 October 1928) is a former American tennis player. Although born in Oregon, Shea and his family moved to California when he was three years old. He started playing tennis when he was around eight years old. Big serving Shea was ranked as high as number 4 in the U. S. in 1957. Making his Grand Slam debut at the U. S. championships in 1948, Shea lost in round three to Jaroslav Drobny. In 1949 he lost in round two to Edward Moylan and in 1950 lost in round one to Hugh Stewart. At the 1952 U. S. Championships, Shea lost in round three to Mervyn Rose. In 1953 he lost in round three to Arthur Larsen. At Roland Garros in 1954 Shea lost in round three to Jaroslav Drobny. At Wimbledon, he lost in the last 16 to Rex Hartwig. At the U. S. Championships, he beat Luis Ayala before losing in round three to Moylan. At Wimbledon 1955, Shea beat Vic Seixas and Adrian Quist before losing in the last 16 to Nicola Pietrangeli. He lost in round one of the U. S. championships. At the 1956 Australian championships, Shea beat a young Roy Emerson (who won 6 titles in the 1960s) before losing in the quarter finals to Neale Fraser. Shea lost in round two of Wimbledon. He reached the last 16 at U. S. championships, losing to Fraser. In 1957 Shea lost in round two of Roland Garros, round one of Wimbledon and round three at U. S. championships. Shea then lost in round one of Wimbledon 1958 and round two at U. S. championships in 1959 and then retired. In later life he played a lot of golf recreationally.
Document 13: Tom Okker: Thomas Samuel Okker (born 22 February 1944) is a former Dutch tennis player. He was ranked among the world's top 10 singles players for seven consecutive years, 1968–74, reaching a career high of World No. 3 in 1969. He also was ranked World No. 1 in doubles in 1969.
Document 14: Andrés Gómez: Andrés Gómez Santos (born February 27, 1960 in Guayaquil, Ecuador) is an Ecuadorian former professional tennis player. He won the Men's Singles title at the French Open in 1990.
Document 15: Thomaz Koch: Thomaz Koch (born May 11, 1945 in Porto Alegre), is a left-handed former tennis player from Brazil, who was a quarter-finalist at the French Open, Wimbledon and the U.S. National Championships.
ground_truth: Sherwood Stewart