Sandon Stolle and Cyril Suk were the defending champions, but Stolle competed with Wayne Black, while Suk competed with Donald Johnson this year. Suk and Johnson were defeated by Stolle and Black in the third round, while Stolle and Black were defeated by Andrei Olhovskiy and David Prinosil in the quarterfinals.
Donald Johnson and Piet Norval defeated Mahesh Bhupathi and Leander Paes in the final, 7–6(10–8), 6–3, 6–4 to win the doubles tennis title at the 2000 ATP Tour World Championships.
Sébastien Lareau and Alex O'Brien won in the final 6–3, 7–6(7–3) against Todd Woodbridge and Mark Woodforde.
Jacco Eltingh and Paul Haarhuis were the defending champions, but Eltingh did not compete this year. Haarhuis competed with American Jared Palmer as the seventh seed, but they were eliminated in the second round by Javier Sánchez and Jan Siemerink.
Todd Woodbridge and Mark Woodforde defeated Paul Haarhuis and Sandon Stolle in the final, 6–3, 6–4, 6–1, to win the gentlemen's doubles title at the 2000 Wimbledon Championships. It was their sixth Wimbledon title and eleventh and last major title overall, though Woodbridge would go on to win the title a further three times partnering Jonas Björkman.
Alex O'Brien and Jared Palmer were the defending champions but they competed with different partners that year, O'Brien with Sébastien Lareau and Palmer with Byron Black.
Mahesh Bhupathi and Leander Paes defeated the defending champion Paul Haarhuis and his partner Jared Palmer in the final, 6–7(10–12), 6–3, 6–4, 7–6(7–4), to win the gentlemen's doubles title at the 1999 Wimbledon Championships.
Byron Black and Jonathan Stark were the defending champions, but lost in the final this year.
Mahesh Bhupathi and Leander Paes were the defending champions. Bhupathi partnered Andrew Florent this year, losing in the second round. Paes did not participate this year.
Brent Haygarth and Aleksandar Kitinov were the defending champions, but did not participate together this year. Haygarth partnered Wayne Ferreira, losing in the first round. Kitinov did not participate.
Wayne Black and Sandon Stolle were the defending champions, but did not partner together this year. Black partnered Andrew Kratzmann, losing in the second round. Stolle partnered Paul Haarhuis, losing in the quarterfinals.
Ellis Ferreira and Rick Leach were the defending champions, but lost in the third round this year.
Todd Woodbridge and Mark Woodforde defeated Paul Haarhuis and Sandon Stolle in the final, 7–6(9–7), 6–4 to win the men's doubles tennis title at the 2000 French Open. With the win, the Woodies completed the career Grand Slam and the career Super Slam.
Lleyton Hewitt and Max Mirnyi defeated Ellis Ferreira and Rick Leach in the final, 6–4, 5–7, 7–6 to win the men's doubles tennis title at the 2000 US Open. It was their maiden major title.
Ellis Ferreira and Rick Leach were the defending champions, but lost in second round to Simon Aspelin and Jaime Oncins
Jonas Björkman and Byron Black were the defending champions, but Black did not compete this year. Björkman teamed up with David Prinosil and lost in semifinals to tournament winners Jiří Novák and David Rikl.
Wayne Arthurs and Andrew Kratzmann were the defending champions, but competed this year with different partners.
Olivier Delaître and Tim Henman were the defending champions, but lost in second round to tournament runners-up Paul Haarhuis and Sandon Stolle.
Andre Agassi and Petr Korda were the defending champions, but Agassi did not compete this year. Korda teamed up with Stefan Edberg and lost in second round to Cyril Suk and Daniel Vacek.
Byron Black and Jonathan Stark were the defending champions, but Black did not compete this year. Stark teamed up with Todd Martin and lost in the quarterfinals to Mark Knowles and Daniel Nestor.
Alex O'Brien 
Paul Haarhuis 
Sandon Stolle 
