1999 Grolsch Open

The 1999 Grolsch Open, also known as the Dutch Open, was an ATP men's tennis tournament played on outdoor clay courts in Amsterdam, Netherlands that was part of the World Series of the 1999 ATP Tour. It was the 42nd edition of the tournament and was held from 2 to 8 August. Sixth-seeded Younes El Aynaoui won the singles title.

1999 Grolsch Open
Date	2–8 August
Edition	42nd
Category	World Series
Draw	32S / 16D
Prize money	$475,000
Surface	Clay / outdoor
Location	Amsterdam, Netherlands
Champions
Singles
Younes El Aynaoui[1]
Doubles
Sjeng Schalken / Paul Haarhuis[2]

Finals

Singles

Main article: 1999 Grolsch Open – Singles

Younes El Aynaoui defeated Mariano Zabaleta 6–0, 6–3

• It was El Aynaoui's first singles title of his career.

Doubles

Main article: 1999 Grolsch Open – Doubles

Sjeng Schalken / Paul Haarhuis defeated Devin Bowen / Eyal Ran 6–3, 6–2