| Singles | |
|---|---|
| 1999 Copenhagen Open | |
| Champion |  Magnus Gustafsson [1] |
| Runner-up |  Fabrice Santoro |
| Score | 6–4, 6–1 |
| Draw | 32 |
| Seeds | 8 |
The 1999 Croatian Indoors was a men's tennis tournament played on indoor carpet courts in Copenhagen, Denmark, that was part of the International Series of the 1999 ATP Tour. It was the twelfth edition of the tournament and was held from 2 February until 9 February 1998.
Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.
Marc Rosset (second round)
Byron Black (semifinals) Magnus Gustafsson (champion) Fabrice Santoro (final)
Davide Sanguinetti (second round)
David Prinosil (first round) Gianluca Pozzi (second round)| Semifinals | Final [1] | ||||||||||||
| Sébastien Grosjean | 6 | 2 | 0 | ||||||||||
| 4 | Fabrice Santoro | 1 | 6 | 6 | |||||||||
| 4 | Fabrice Santoro | 4 | 1 | ||||||||||
| 3 | Magnus Gustafsson | 6 | 6 | ||||||||||
| 3 | Magnus Gustafsson | 6 | 6 | ||||||||||
| 2 | Byron Black | 3 | 1 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Rosset | 2 | 6 | 6 | |||||||||||||||||||||||
 G Cañas | 6 | 3 | 3 | 1 | M Rosset | 66 | 4 | ||||||||||||||||||||
 D Nestor | 6 | 6 | D Nestor | 7 | 6 | ||||||||||||||||||||||
 A Voinea | 3 | 2 | D Nestor | 6 | 5 | 4 | |||||||||||||||||||||
| S Grosjean | 7 | 4 | 6 | S Grosjean | 4 | 7 | 6 | ||||||||||||||||||||
| M-K Goellner | 65 | 6 | 3 | S Grosjean | 6 | 7 | |||||||||||||||||||||
 F Fetterlein | 6 | 6 | F Fetterlein | 2 | 5 | ||||||||||||||||||||||
| 7 | D Prinosil | 1 | 4 | S Grosjean | 6 | 2 | 0 | ||||||||||||||||||||
| 4 | F Santoro | 6 | 6 | 4 | F Santoro | 1 | 6 | 6 | |||||||||||||||||||
| T Larsen | 3 | 0 | 4 | F Santoro | 6 | 6 | |||||||||||||||||||||
 S Koubek | 7 | 6 | S Koubek | 1 | 2 | ||||||||||||||||||||||
| A Clément | 5 | 2 | 4 | F Santoro | 6 | 2 | |||||||||||||||||||||
| R Schüttler | 4 | 6 | 6 | R Schüttler | 3 | 0r | |||||||||||||||||||||
| L Tieleman | 6 | 4 | 2 | R Schüttler | 6 | 7 | |||||||||||||||||||||
| B Karbacher | 6 | 6 | B Karbacher | 3 | 64 | ||||||||||||||||||||||
 J Krošlák | 3 | 4 | |||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | D Sanguinetti | 6 | 66 | 6 | |||||||||||||||||||||||
| J Landsberg | 2 | 7 | 1 | 6 | D Sanguinetti | 61 | 3 | ||||||||||||||||||||
| W Black | 5 | 6 | 6 | W Black | 7 | 6 | |||||||||||||||||||||
 T Ketola | 7 | 3 | 0 | W Black | 4 | 6 | 2 | ||||||||||||||||||||
 N Godwin | 6 | 6 | 3 | M Gustafsson | 6 | 4 | 6 | ||||||||||||||||||||
 P Wessels | 2 | 3 | N Godwin | 3 | 7 | 5 | |||||||||||||||||||||
| 3 | M Gustafsson | 7 | 7 | 3 | M Gustafsson | 6 | 65 | 7 | |||||||||||||||||||
| K Carlsen | 5 | 5 | 3 | M Gustafsson | 6 | 6 | |||||||||||||||||||||
| 8 | G Pozzi | 4 | 7 | 6 | 2 | B Black | 3 | 1 | |||||||||||||||||||
| M Tillström | 6 | 5 | 2 | 8 | G Pozzi | 5 | 6 | 63 | |||||||||||||||||||
 M Mirnyi | 7 | 7 | M Mirnyi | 7 | 4 | 7 | |||||||||||||||||||||
| M Kohlmann | 65 | 6 | M Mirnyi | 7 | 3 | 3 | |||||||||||||||||||||
| N Kulti | 6 | 6 | 2 | B Black | 65 | 6 | 6 | ||||||||||||||||||||
| A Vinciguerra | 1 | 3 | N Kulti | 65 | 6 | 3 | |||||||||||||||||||||
| 2 | B Black | 6 | 6 | 2 | B Black | 7 | 3 | 6 | |||||||||||||||||||
| K Pless | 2 | 3 | |||||||||||||||||||||||||
Billie Jean King was the defending champion and she won in the final 6–3, 7–5 against Alycia Moulton. It was King's last singles tournament title of her career and she became the oldest WTA player to win a singles tournament at 39 years, 7 months and 23 days.
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[* https://www.atptour.com/en/scores/archive/copenhagen/481/1999/draws?matchtype=singles Main draw] [* https://web.archive.org/web/20100202175124/http://www.stevegtennis.com/results/1999/q-copenhagen.txt Qualfying draw]