The 1999 Croatia Open, also known as the International Championship of Croatia-Umag, was a men's tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the World Series of the 1999 ATP Tour. It was the tenth edition of the tournament and was held from 26 July until 1 August 1999. Eighth-seeded Magnus Norman won the singles title.[1]
See main article: 1999 Croatia Open – Singles. 
Magnus Norman defeated 
Jeff Tarango, 6–2, 6–4
See main article: 1999 Croatia Open – Doubles. 
Mariano Puerta / 
Javier Sánchez defeated 
Massimo Bertolini / Cristian Brandi, 3–6, 6–2, 6–3