Question: Which professional tennis player achieved a higher World ranking, Bob Lutz or Goran Ivanišević?

full_context: Document 1: Bob Lutz (tennis): Robert Lutz (born August 29, 1947) is a former amateur and professional tennis player of the 1960s and 1970s. He and his longtime partner Stan Smith were one of the best doubles teams of all time. Bud Collins ranked Lutz as World No. 7 in 1972. Between 1967 and 1977 he was ranked among the top-10 American players 8 times, with his highest ranking being No. 5 in both 1968 and 1970.
Document 2: Bob Bryan: Robert Charles Bryan (born April 29, 1978) is an American male professional tennis player. He has won twenty-three Grand Slam titles: 16 in men's doubles and 7 in mixed doubles. He turned professional in 1998. With his twin brother Mike, he has been world No. 1 doubles player for much of the last several years, first achieving the top ranking in September 2003. The brothers were named ATP Team of the Decade for 2000–2009. The brothers became the second men's doubles team to complete the career golden slam at the 2012 Summer Olympics.
Document 3: Guillermo Cañas: Guillermo Ignacio Cañas (born November 25, 1977), often referred to as Willy Cañas, is a retired Argentine professional tennis player. He was born in Argentina's capital, Buenos Aires, and named after Argentine tennis star Guillermo Vilas. His career-high singles ranking was World No. 8, achieved in June 2005. Cañas was the coach of Ernests Gulbis from July 2011 until May 2012 and became the coach of Teymuraz Gabashvili in 2015. Since January 2017, he is coaching former #1, Jelena Jankovic.
Document 4: Marin Čilić career statistics: This is a list of the main career statistics of Croatian professional tennis player, Marin Čilić. To date, Čilić has won 16 ATP singles titles including one grand slam singles title at the 2014 US Open, one ATP Masters 1000 title at the 2016 Western & Southern Open and a record four titles at the PBZ Zagreb Indoors. Other highlights of Čilić's career thus far include a semi-final appearance at the 2010 Australian Open and three consecutive quarterfinals at the Wimbledon Championships from 2014 to 2016. Čilić achieved a career high singles ranking of World No. 6 on November 21st, 2016.
Document 5: 1973 WCT World Doubles – Doubles: This was the first edition of the WCT World Doubles tennis tournament. The eight highest ranking teams qualified for the event. Third seeds, Robert Lutz and Stan Smith won the tournament in straight sets in the final against Tom Okker and Marty Riessen
Document 6: Goran Ivanišević: Goran Ivanišević (; born 13 September 1971) is a retired Croatian professional tennis player and current tennis coach. He is the only person to win the men's singles title at Wimbledon as a wildcard. He achieved this in 2001, having previously been runner-up at the championships in 1992, 1994 and 1998. Before the 2001 tournament, he was ranked 125th and after his victory he was 16th. His career-high singles ranking was World No. 2 (behind Pete Sampras) in 1994. He coached Marin Čilić from September 2013 to July 2016, leading Čilić to his biggest achievement to date, the 2014 US Open title.
Document 7: Bob Lutz (businessman): Robert Anthony Lutz (born February 12, 1932) is a Swiss American automotive executive and a former Vice Chairman of General Motors.
Document 8: 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 9: Ivan Dodig: Ivan Dodig (born 2 January 1985) is a Croatian tennis player. His career-high ATP rankings are world No. 29 in singles and world No. 4 in doubles. Dodig is a Grand Slam champion after winning the 2015 French Open men's doubles title with Marcelo Melo.
Document 10: Robert Lindstedt: Robert Lindstedt (born 19 March 1977) is a Swedish professional tennis player, who turned pro in 1998, and is a doubles specialist. His biggest title has been the 2014 Australian Open with partner Łukasz Kubot. He is also a three-time Wimbledon finalist with former partner Horia Tecău.
Document 11: Marin Čilić: Marin Čilić (; born 28 September 1988) is a Croatian professional tennis player. Over the course of his career, Čilić has won 17 ATP singles titles, including the 2014 US Open. His career-high singles ranking is world No. 5, achieved in September 2017. Čilić first came to international prominence by defeating then-World No. 2 Andy Murray in the fourth round of the 2009 US Open. He followed this by reaching the semifinals of the 2010 Australian Open. Among other achievements, Čilić was runner-up at the 2017 Wimbledon Championships, and was a semifinalist at the 2015 US Open as defending champion. Čilić is currently the youngest active male player to have won a slam. Čilić has reached at least the quarterfinal in all four grand slam tournaments. He has a very powerful serve and very powerful groundstrokes.
Document 12: 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 13: Iva Majoli: Iva Majoli Marić (Iva Majoli) (born 12 August 1977) is a former professional tennis player from Croatia. She upset Martina Hingis to win the women's singles title at the French Open in 1997. Majoli also won seven other singles titles and one doubles title during her career. She reached a career-high singles ranking of world No. 4 in February 1996.
Document 14: 1970 Australian Open – Men's Doubles: Bob Lutz and Stan Smith defeated John Alexander and Phil Dent 6–3, 8–6, 6–3 in the final to win the Men's Doubles title at the 1970 Australian Open.
Document 15: Robert Seguso: Robert Arthur Seguso (born May 1, 1963) is a former professional tennis player from the United States. A doubles specialist, he won four Grand Slam men's doubles titles (two Wimbledon, one French Open and one US Open). He also won the men's doubles Gold Medal at the 1988 Olympic Games in Seoul, partnering Ken Flach. Seguso reached the World No. 1 doubles ranking in 1985. He won a total of 29 career doubles titles between 1984 and 1991.
ground_truth: Goran Ivanišević