| Singles | |
|---|---|
| 1989 BP National Championships | |
| Champion |  Kelly Evernden |
| Runner-up |  Shuzo Matsuoka |
| Final score | 7–5, 6–1, 6–4 |
| Draw | 32 |
| Seeds | 8 |
Ramesh Krishnan was the defending champion but lost in the first round to Patrick Baur.
Kelly Evernden won in the final 7–5, 6–1, 6–4 against Shuzo Matsuoka.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
Ramesh Krishnan (first round)
Milan Šrejber (quarterfinals)
Michiel Schapers (first round) Shuzo Matsuoka (final)
Tobias Svantesson (quarterfinals)
Danilo Marcelino (first round)
Glenn Michibata (semifinals) Kelly Evernden (champion)| Final | ||||||||
| 4 | Shuzo Matsuoka | 5 | 1 | 4 | ||||
| 8 | Kelly Evernden | 7 | 6 | 6 | ||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | R Krishnan | 4 | 6 | 3 | |||||||||||||||||||||||
 P Baur | 6 | 1 | 6 | P Baur | 6 | 6 | |||||||||||||||||||||
| C Pridham | 4 | 5 | Q |  R Weiss | 4 | 3 | |||||||||||||||||||||
| Q | R Weiss | 6 | 7 | P Baur | 6 | 4 | |||||||||||||||||||||
| H Moraing | 7 | 6 | 7 | G Michibata | 7 | 6 | |||||||||||||||||||||
 N Marques | 6 | 3 | H Moraing | 2 | 4 | ||||||||||||||||||||||
| L-A Wahlgren | 6 | 6 | 3 | 7 | G Michibata | 6 | 6 | ||||||||||||||||||||
| 7 | G Michibata | 7 | 1 | 6 | 7 | G Michibata | 0 | 3 | |||||||||||||||||||
| 4 | S Matsuoka | 6 | 6 | 4 | S Matsuoka | 6 | 6 | ||||||||||||||||||||
| F Dennhardt | 2 | 1 | 4 | S Matsuoka | 7 | 7 | |||||||||||||||||||||
| Q | D Wheaton | 6 | 7 | Q | D Wheaton | 6 | 6 | ||||||||||||||||||||
| Q | L Jensen | 4 | 6 | 4 | S Matsuoka | 6 | 6 | ||||||||||||||||||||
| S Guy | 6 | 6 | 5 | T Svantesson | 4 | 4 | |||||||||||||||||||||
| Q | M Allen | 3 | 2 | S Guy | 6 | 6 | 5 | ||||||||||||||||||||
| J Cunha e Silva | 5 | 4 | 5 | T Svantesson | 3 | 7 | 7 | ||||||||||||||||||||
| 5 | T Svantesson | 7 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | D Marcelino | 4 | 6 | ||||||||||||||||||||||||
 R Smith | 6 | 7 | R Smith | 6 | 6 | 1 | |||||||||||||||||||||
| P Chamberlin | 7 | 6 | P Chamberlin | 3 | 7 | 6 | |||||||||||||||||||||
 G Pozzi | 6 | 4 | P Chamberlin | 7 | 7 | ||||||||||||||||||||||
 P Doohan | 2 | 5 |  D Burke | 6 | 5 | ||||||||||||||||||||||
| D Burke | 6 | 7 | D Burke | 6 | 3 | 6 | |||||||||||||||||||||
| WC | D Lewis | 6 | 6 | WC | D Lewis | 3 | 6 | 1 | |||||||||||||||||||
| 3 | M Schapers | 3 | 4 | P Chamberlin | 2 | 4 | |||||||||||||||||||||
| 8 | K Evernden | 6 | 2 | 6 | 8 | K Evernden | 6 | 6 | |||||||||||||||||||
 P Wekesa | 1 | 6 | 1 | 8 | K Evernden | 3 | 6 | 6 | |||||||||||||||||||
| M Kures | 3 | 3 | M Oosting | 6 | 3 | 4 | |||||||||||||||||||||
| M Oosting | 6 | 6 | 8 | K Evernden | 6 | 6 | |||||||||||||||||||||
| WC | B Steven | 7 | 6 | 2 | M Šrejber | 3 | 2 | ||||||||||||||||||||
| WC | B Derlin | 6 | 2 | WC | B Steven | 3 | 3 | ||||||||||||||||||||
| LL |  C Bailey | 4 | 2 | 2 | M Šrejber | 6 | 6 | ||||||||||||||||||||
| 2 | M Šrejber | 6 | 6 | ||||||||||||||||||||||||
Miloslav Mečíř defeated Michiel Schapers 6–4, 6–3, 3–6, 6–4 to win the 1986 Heineken Open singles competition. Chris Lewis was the champion but did not defend his title.
Ramesh Krishnan defeated Amos Mansdorf 6–4, 6–0 to win the 1989 Heineken Open singles competition. Mansdorf was the defending champion.
Ramesh Krishnan was the defending champion but lost in the semifinals to Scott Davis.
Kelly Evernden and Todd Witsken were the defending champions but they competed with different partners that year, Evernden with Nicolás Pereira and Witsken with Jorge Lozano.
Boris Becker was the defending champion and won in the final 6–1, 3–6, 6–3 against Stefan Edberg.
John McEnroe was the defending champion but lost in the semifinals to Boris Becker.
Jorge Lozano and Todd Witsken won in the final 6–3, 7–6 against Pieter Aldrich and Danie Visser.
Kelly Jones won in the final 6–1, 7–5 against Amos Mansdorf.
Greg Rusedski was the defending champion but lost in the quarterfinals to Martin Damm.
David Prinosil was the defending champion but did not compete that year.
Kelly Evernden was the defending champion but lost in the first round to Lars-Anders Wahlgren.
Peter Doohan and Laurie Warder were the defending champions, but only Warder competed that year with Tim Pawsat.
Simon Youl was the defending champion, but did not participate this year.
Andre Agassi was the defending champion, but did not participate this year.
Vijay Amritraj was the defending champion, but lost in the third round this year.
Kelly Evernden was the defending champion, but lost in the third round this year.
José Luis Clerc was the defending champion, but lost to José Higueras in the semifinals. Fifth seed Higueras defeated Jimmy Arias in the final to claim the title and first prize money of $32,000.
Stefan Edberg was the defending champion, but lost in the third round to Jim Grabb.
Martin Davis and Tim Pawsat were the defending champions, but Davis chose to compete at Sydney in the same week. Pawsat teamed up with Tobias Svantesson and lost in the first round to Luke Jensen and Richey Reneberg.