Mark Keil and Peter Nyborg were the defending champions but they competed with different partners that year, Keil with Jeff Tarango and Nyborg with Menno Oosting.
Menno Oosting (17 May 1964 – 22 February 1999) was a professional tennis player from the Netherlands, who won seven ATP Tour doubles titles out of 18 finals in his career.
Andrea Gaudenzi and Goran Ivanišević were the defending champions but they competed with different partners that year, Gaudenzi with Marc Rosset and Ivanišević with Sasa Hirszon.
Menno Oosting and Libor Pimek were the defending champions but they competed with different partners that year, Oosting with David Adams and Pimek with Peter Nyborg.
Pete Sampras was the defending champion, and he successfully defended his title, defeating Goran Ivanišević, 6–7, 7–6, 6–4, 3–6, 6–2, in the final.
 With this win, Sampras equalled Björn Borg's record of five Wimbledon titles.
Jonas Björkman and Nicklas Kulti won in the final 6–4, 6–4 against Yevgeny Kafelnikov and Menno Oosting.
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.
Jeff Tarango and Daniel Vacek won in the final 3–6, 6–3, 7–5 against Menno Oosting and Andrei Pavel.
The 1991 Davis Cup was the 80th edition of the most important tournament between national teams in men's tennis.
 A total of 87 nations participated in the tournament.
 In the final, France defeated the United States at the Palais des Sports de Gerland in Lyon, France, on 29 November - 1 December.
 During the tournament, Yugoslavia was in the process of dissolving.
 Croatian tennis players Goran Ivanišević and Goran Prpić withdrew from the team after the declaration of Croatian independence, with the team losing its subsequent draw against France.
Menno Oosting and Libor Pimek won in the final 6–3, 7–6 against Martin Damm and Hendrik Jan Davids.

Question: Who won Wimbledon more times, Menno Oosting or Goran Ivanišević?
Answer: Goran Ivanišević