| Men's singles | |
|---|---|
| 1989 OTB Open | |
| Champion |  Simon Youl |
| Runner-up |  Scott Davis |
| Score | 2–6, 6–4, 6–4 |
| Draw | 32 |
| Seeds | 8 |
Tim Mayotte was the defending champion, but did not participate this year.
Simon Youl won the tournament, beating Scott Davis in the final, 2–6, 6–4, 6–4.
Dan Goldie (semifinals) Richard Matuszewski (first round)
Ramesh Krishnan (quarterfinals) Scott Davis (final) John Frawley (first round)
Martin Laurendeau (second round) Jeff Tarango (quarterfinals) Glenn Michibata (semifinals)| Semifinals | Final | ||||||||||||
| 1 | Dan Goldie | 6 | 4 | 1 | |||||||||
| 4 | Scott Davis | 3 | 6 | 6 | |||||||||
| 4 | Scott Davis | 6 | 4 | 4 | |||||||||
| Simon Youl | 2 | 6 | 6 | ||||||||||
| Simon Youl | 3 | 7 | 7 | ||||||||||
| 8 | Glenn Michibata | 6 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | D Goldie | 6 | 6 | ||||||||||||||||||||||||
| B Dyke | 3 | 3 | 1 | D Goldie | 6 | 6 | |||||||||||||||||||||
 M Nido | 3 | 7 | 7 | M Nido | 2 | 4 | |||||||||||||||||||||
| P Johnson | 6 | 6 | 6 | 1 | D Goldie | 1 | 7 | 6 | |||||||||||||||||||
| N Caswell | 5 | 2 | 7 | J Tarango | 6 | 6 | 2 | ||||||||||||||||||||
| V Amritraj | 7 | 6 | V Amritraj | 3 | 3 | ||||||||||||||||||||||
| Q | G Connell | 3 | 4 | 7 | J Tarango | 6 | 6 | ||||||||||||||||||||
| 7 | J Tarango | 6 | 6 | 1 | D Goldie | 6 | 4 | 1 | |||||||||||||||||||
| 4 | S Davis | 6 | 7 | 6 | 4 | S Davis | 3 | 6 | 6 | ||||||||||||||||||
| Q | J Boytim | 7 | 6 | 2 | 4 | S Davis | 7 | 6 | |||||||||||||||||||
| M Allen | 2 | 4 |  N Broad | 5 | 1 | ||||||||||||||||||||||
| N Broad | 6 | 6 | 4 | S Davis | 7 | 6 | |||||||||||||||||||||
 M Robertson | 6 | 3 | 7 | S Warner | 5 | 1 | |||||||||||||||||||||
| WC | C Garner | 1 | 6 | 6 | M Robertson | 7 | 6 | 5 | |||||||||||||||||||
| S Warner | 6 | 6 | S Warner | 6 | 7 | 7 | |||||||||||||||||||||
| 5 | J Frawley | 3 | 4 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | M Laurendeau | 6 | 6 | ||||||||||||||||||||||||
| WC | T Ho | 1 | 4 | 6 | M Laurendeau | 4 | 0 | ||||||||||||||||||||
| S Youl | 6 | 4 | 7 | S Youl | 6 | 6 | |||||||||||||||||||||
| R Fromberg | 2 | 6 | 5 | S Youl | 6 | 3 | 7 | ||||||||||||||||||||
 JC Báguena | 2 | 4 | 3 | R Krishnan | 3 | 6 | 5 | ||||||||||||||||||||
 D Burke | 6 | 6 | D Burke | 3 | 2 | ||||||||||||||||||||||
| Q | B Pearce | 3 | 3 | 3 | R Krishnan | 6 | 6 | ||||||||||||||||||||
| 3 | R Krishnan | 6 | 6 | S Youl | 3 | 7 | 7 | ||||||||||||||||||||
| 8 | G Michibata | 6 | 6 | 6 | 8 | G Michibata | 6 | 6 | 6 | ||||||||||||||||||
| B Moir | 4 | 7 | 4 | 8 | G Michibata | 6 | 6 | ||||||||||||||||||||
| K Kinnear | 6 | 4 | 4 |  N Odizor | 2 | 3 | |||||||||||||||||||||
| N Odizor | 4 | 6 | 6 | 8 | G Michibata | 7 | 6 | ||||||||||||||||||||
| Q |  V Jansson | 4 | 4 | C Pridham | 6 | 4 | |||||||||||||||||||||
| C Pridham | 6 | 6 | C Pridham | 3 | 6 | 6 | |||||||||||||||||||||
 O Rahnasto | 6 | 2 | 6 | O Rahnasto | 6 | 1 | 2 | ||||||||||||||||||||
| 2 | R Matuszewski | 3 | 6 | 4 | |||||||||||||||||||||||
Mats Wilander defeated Ivan Lendl in the final, 6–1, 6–4, 6–4 to win the men's singles tennis title at the 1983 Australian Open.
Ramesh Krishnan was the defending champion but lost in the semifinals to Scott Davis.
Jorge Lozano and Todd Witsken were the defending champions, but lost in the quarterfinals this year.
David Pate and Scott Warner were the defending champions but only Pate competed that year with Scott Davis.
Ivan Lendl was the defending champion and won in the final 6–3, 6–2 against Boris Becker.
Elizabeth Sayers and John Fitzgerald were the defending champions but lost in the final 2–6, 7–5, 6–4 against Manuela Maleeva and Tom Gullikson.
Jo Durie and Jeremy Bates were the defending champions but lost in the quarterfinals to Robin White and Scott Davis.
Olivier Delaître and Jeff Tarango were the defending champions but did not compete that year.
Paul Annacone and Christo van Rensburg were the defending champions. Annacone participated with John Fitzgerald, and lost in the quarterfinals to Scott Davis and David Pate, while Van Rensburg played with Kevin Curren, and lost in the semifinals to Grant Connell and Glenn Michibata.
Rick Leach and Jim Pugh defeated Connell and Michibata 3–6, 6–4, 6–2, in the final.
Scott Davis and David Pate were the defending champions, but lost in the second round this year.
Pieter Aldrich and Danie Visser were the defending champions, but lost in the first round to Paul Haarhuis and Mark Koevermans.
Scott Davis and David Pate won the title, defeating Patrick McEnroe and David Wheaton 6–1, 4–6, 6–4, 5–7, 9–7, in the final. This was Pate's first Grand Slam title and final, despite gaining the World No. 1 ranking two weeks earlier.
John Fitzgerald and Anders Järryd lost in the third round to McEnroe and Wheaton. It was their only Grand Slam loss of the year, as they would go on to win the following three majors in 1991.
For the 1990 Tokyo Indoor doubles Kevin Curren and David Pate were the defending champions, but Curren did not participate this year. Pate partnered Scott Davis, losing in the final.
Pat Cash and Patrick Rafter were the defending champions, but lost in the quarterfinals this year.
Rick Leach and Jim Pugh were the defending champions.
Thierry Tulasne defeated Hans-Dieter Beutel in the final, 6–4, 3–6, 6–4 to win the boys' singles tennis title at the 1980 Wimbledon Championships.
Andre Agassi was the defending champion and successfully defended his title, by defeating Petr Korda 6–3, 6–4 in the final.
Grant Connell and Glenn Michibata were the defending champions, but lost in the semifinals to tournament runners-up Ken Flach and Robert Seguso.
John Fitzgerald and Mark Woodforde were the defending champions, but lost in the quarterfinals to Mark Philippoussis and Patrick Rafter.
Scott Davis and David Pate were the defending champions, but lost in the first round to Nicolás Pereira and Pete Sampras.
Paul Annacone and David Wheaton were the defending champions, but Wheaton chose not to participate. Annacone partnered with Doug Flach, but lost to Jim Grabb and Richey Reneberg in the first round.