| Singles | |
|---|---|
| 1999 Monte Carlo Open | |
| Champion |
|
| Runner-up |
|
| Final score | 6–4, 2–1, retired |
| Seeds | 16 |
Carlos Moyá was the defending champion but he lost in the quarter-finals to Jérôme Golmard.
Gustavo Kuerten was leading in the final 6–4, 2–1 in the final against Marcelo Ríos when Rios had to retire injured.
The top eight seeds received a bye to the second round.