Question: Who was born first, Xavier Malisse or Gene Mayer?

full_context: Document 1: Gene Mayer: Gene Mayer (born April 11, 1956) is a former tennis player from the United States who won 14 singles titles during his career.
Document 2: 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 3: 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.
Document 4: 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 5: 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 6: 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 7: Xavier Malisse: Xavier Malisse (born 19 July 1980) is Belgian retired professional tennis player. Born in the north-western Flemish city of Kortrijk and nicknamed "X-Man", he is only one of two players from Belgium (the other being David Goffin) to have been ranked in the top 20 of the ATP tour, with a career-high singles ranking of World No. 19.
Document 8: Olivier Rochus: Olivier Rochus (] ; born 18 January 1981) is a retired Belgian tennis player. He has won two singles titles in his career and in 2004 won the French Open doubles title partnering fellow Belgian Xavier Malisse. Rochus' career-high singles ranking is World No. 24.
Document 9: Félix Auger-Aliassime: Félix Auger-Aliassime (born August 8, 2000) is a Canadian professional tennis player. He reached a career high ATP singles ranking of No. 161 on September 18, 2017 and a career high ITF junior ranking of No. 2 on June 6, 2016. He is the youngest player ever to qualify and to win a main draw match on the ATP Challenger Tour. With his titles at the Open Sopra Steria de Lyon in June 2017 and the Copa Sevilla in September 2017, he became the seventh youngest player in history (16 years, 10 months) to win an ATP Challenger title and the second youngest to win multiple ATP Challenger titles. Auger-Aliassime won the 2016 US Open junior singles title and the 2015 US Open junior doubles title with compatriot Denis Shapovalov.
Document 10: 2012 Farmers Classic – Doubles: Xavier Malisse, with fellow countryman Ruben Bemelmans, defended his title, defeating Jamie Delgado and Ken Skupski 7–6, 4–6, [10–7] in the final. Mark Knowles and Malisse were the defending champions but Knowles decided not to participate.
Document 11: 1980 Congoleum Classic – Doubles: Gene Mayer and Sandy Mayer were the defending champions and were one of sixteen teams in the second round.
Document 12: 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 13: Kim Clijsters: Kim Antonie Lode Clijsters (] ; born 8 June 1983) is a Belgian former professional tennis player. Clijsters is a former world No. 1 in both singles and doubles.
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: Guadalajara Open: The Guadalajara Open is a defunct tennis tournament that was played on the Grand Prix tennis circuit in 1978. The event was held in Guadalajara, Mexico and was played on outdoor clay courts. Gene Mayer won the singles title while Sandy Mayer and Sherwood Stewart partnered to win the doubles title.
ground_truth: Gene Mayer