Question: Who was born first, Piet Norval or Raúl Ramírez?

full_context: Document 1: Bent-Ove Pedersen: Bent-Ove Pedersen (born 11 July 1967 in Oslo) is a former tennis player from Norway, who turned professional in 1992. He spent several years playing tennis at Berkeley in California. The right-hander represented his native country in the doubles competition at the 1992 Summer Olympics in Barcelona, where he partnered Christian Ruud. The pair was defeated in the first round by South Africa's eventual runners-up Wayne Ferreira and Piet Norval. Pedersen reached his highest singles ATP-ranking on 13 September 1993, when he became the number 366 of the world. He was in quarterfinal in US Open doubles, 1991, partnering Matt Lucena from the US. He became the number 78 on the doubles ranking 30. August 1993.
Document 2: Tennis in Peru: Luis Horna and Jaime Yzaga are the most famous Peruvian tennis players. Tennis Hall of Famer and Davis Cup and Wimbledon winner Alejandro Olmedo was born in Peru but played for the United States only for Davis Cup. Laura Arraya is a best Peruvian Tennis player in women's. Her brother is Pablo Arraya, a former Peruvian tennis player.
Document 3: Andy Norval: Born in South Australia, where, as a youth, he played Australian Rules football, Norval began his rugby league career in the Newcastle competition before moving to Sydney where he played 105 matches with the Eastern Suburbs club in the years (1934–41). Norval a lock forward played an integral role in an Eastern Suburbs sides that swept all before them during that period, winning 4 premierships as well as finishing runners-up on three other occasions.
Document 4: Piet Norval: Pieter ("Piet") Norval (born 7 April 1970) is a former tennis player from South Africa, who turned professional in 1988. The right-hander represented his native country in the doubles competition at the 1992 Summer Olympics in Barcelona, where he partnered Wayne Ferreira. The pair won the silver medal, after losing the final to Boris Becker and Michael Stich from Germany. Norval reached his highest singles ATP-ranking on 19 June 1989, when he became the no. 125 of the world.
Document 5: 1994 Grand Prix Hassan II – Doubles: Mike Bauer and Piet Norval were the defending champions, but did not participate this year.
Document 6: Rafael Nadal: Rafael "Rafa" Nadal Parera (] , ] ; born 3 June 1986) is a Spanish professional tennis player, currently ranked World No. 1 in men's singles. Known as "The King of Clay", he is widely regarded as the greatest clay-court player in history. His evolution into an all-court threat has established him as one of the greatest tennis players ever.
Document 7: Manuel Orantes: Manuel Orantes Corral (] ; born 6 February 1949) is a former tennis player who was active in the 1970s and 1980s. He won the US Open men's singles in 1975, beating defending champion Jimmy Connors in the final. Orantes reached a career-high singles ranking of World No. 2.
Document 8: Pete Sampras: Pete Sampras (born August 12, 1971) is a retired American tennis player widely regarded as one of the greatest in the history of the sport. He was a right-handed player with a single-handed backhand and a precise and powerful serve that earned him the nickname "Pistol Pete". His professional career began in 1988 and ended at the 2002 US Open, which he won, defeating rival Andre Agassi in the final.
Document 9: Haroon Rahim: Haroon Rahim, (born 12 November 1949) is a Pakistani former tennis player. The former Pakistan and Asian No. 1, Rahim was the youngest tennis player ever to play for Pakistan in the Davis Cup at 15 years of age. He was also the highest ranking Pakistani tennis player ever (a career-high singles ranking of World No. 44 in July 1977). He led the UCLA team to victory with Jeff Borowiak and Jimmy Connors in 1970–71 and was 1971 NCAA doubles champion with Jeff Borowiak.
Document 10: 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 11: 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 12: Raúl Ramírez: Raúl Ramírez (born 20 June 1953) is a retired Mexican professional tennis player. He was active during the 1970s and 1980s, and is regarded as one of the great all-around players of the modern era. Ramírez was also the first player to finish first in both singles and doubles Grand Prix point standings, accomplishing the feat in 1976. He attended and played tennis at the University of Southern California in Los Angeles.
Document 13: Jorge Lozano: Jorge Lozano (born 17 May 1963 in San Luis Potosí) is a retired professional tennis player from Mexico. He reached his highest doubles ranking of World No. 4 in August 1988. His highest singles ranking was World No. 51, achieved the following month. During his career, he won two mixed doubles titles at the French Open: in 1990 with Arantxa Sánchez, and in 1988 with Lori McNeil. He reached the round of 16 in singles at the 1988 US Open and also the semifinal in doubles that same year. Qualified twice for the Doubles Masters at the Royal Albert Hall in London and reached the semifinals in 1988. In his career, he won nine doubles titles, but no singles titles. He turned professional in 1986, and in his career, he won $U.S.739,424 in prize money. He was the first player to be beaten by Pete Sampras in the main draw of a Grand Slam tournament, at the French Open in 1989. In Davis Cup play, represented Mexico for 15 years, 1981–1995, won 12 doubles matches, and lost 12 as well. He lost 11 singles matches, and won 8, making his overall win / loss record at the Davis Cup 20–23. Lozano won his first title at Forest Hills in 1988, with his partner Todd Witsken, and won his last at Athens in 1993. He resides in Guadalajara, Mexico where he directs a tennis academy for kids and also coaches the men and women tennis team at the University Tec de Monterrey. He is currently the captain of the Mexican Davis Cup Team.
Document 14: Boris Becker: Boris Franz Becker (] ; born 22 November 1967) is a German former world No. 1 professional tennis player. He was successful from the start of his career, winning the first of his six major singles titles aged 17. He also won five year-end championships, 13 Masters Series titles, and an Olympic gold medal in doubles. "Tennis" magazine ranked him the 11th best male player of the period 1965–2005.
Document 15: Marc Rosset: Marc Rosset (born 7 November 1970) is a former professional tennis player from Switzerland who is best remembered for winning the men's singles gold medal at the 1992 Olympic Games. He also won one Grand Slam doubles title at the French Open in 1992 partnering compatriot Jakob Hlasek.
ground_truth: Raúl Ramírez