Has Bob Lutz been ranked among the top-10 american tennis players more times than Sergi Bruguera?
yes
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.
Sergi Bruguera
Sergi Bruguera i Torner (] ; born 16 January 1971) is a former professional tennis player from Catalonia, Spain.
 He won consecutive men's singles titles at the French Open in 1993 and 1994.
 As of 2016, he has won the most Grand Slam titles for someone not inducted to the International Tennis Hall of Fame.
Stan Smith
Stanley Roger Smith (born December 14, 1946 in Pasadena, California) is a former world No. 1 American tennis player and two-time Grand Slam singles champion who also, with his partner Bob Lutz, formed one of the most successful doubles teams of all time.
 Together, they won many major titles all over the world.
 In 1970, Smith won the first year end championship Masters Grand Prix title.
 Smith's two major singles titles were the 1971 US Open (over Jan Kodeš in the final), and 1972 Wimbledon (over Ilie Năstase in the final).
 In 1972, he was the year-ending world No. 1 singles player.
 In 1973, he won his second and last year end championship title at the Dallas WCT Finals.
 In addition, he won four Grand Prix Championship Series titles.
 His name is also used in a popular brand of tennis shoes.
 In his early years he improved his tennis game through lessons from Pancho Segura and the Pasadena Tennis Patrons. 1994 Dubai Tennis Championships – Singles
Magnus Gustafsson defeated Sergi Bruguera 6–4 6–2 to win the 1994 Dubai Tennis Championships singles event.
 Karel Nováček was the defending champion. 2017 French Open – Legends Over 45 Doubles
Sergi Bruguera and Goran Ivanišević were the defending champions, but were eliminated in the round-robin competition. 1992 Estoril Open – Men's Singles
Sergi Bruguera was the defending champion, but finished runner-up this year. 1992 Saab International – Singles
Sergi Bruguera was the defending champion but was forced to retire in the final losing 7–5, 3–0 against Jordi Arrese. Janet Hopps Adkisson
Janet Hopps Adkisson (born August 4, 1934) was an American tennis player.
 Adkisson was ranked in the top 15 female tennis players three times and was, according to the State of Washington Sports Hall of Fame, "once recognized as one of the world's top woman tennis players". 1991 Estoril Open – Men's Singles
Sergi Bruguera won in the final 7–6, 6–1, defeating Karel Nováček. 1993 French Open – Men's Singles
Sergi Bruguera defeated Jim Courier 6–4, 2–6, 6–2, 3–6, 6–3 in the final to win the Men's Singles tennis title at the 1993 French Open.