2019 Croatia Open Umag

The 2019 Croatia Open (also known as the Plava Laguna Croatia Open Umag for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts. It was the 30th edition of the Croatia Open, and part of the 250 Series of the 2019 ATP Tour. It took place at the International Tennis Center in Umag, Croatia, from 15 July through 21 July 2019.

Seeds

 * 1 Rankings are as of July 1, 2019

Other entrants
The following players received wildcards into the singles main draw:
 * Viktor Galović
 * Nino Serdarušić
 * 🇮🇹 Jannik Sinner

The following player received entry using a protected ranking into the main draw:
 * 🇩🇪 Cedrik-Marcel Stebe

The following players received entry from the qualifying draw:
 * 🇭🇺 Attila Balázs
 * 🇮🇹 Salvatore Caruso
 * 🇩🇪 Peter Torebko
 * 🇦🇷 Marco Trungelliti

Withdrawals

 * Before the tournament
 * 🇭🇺 Márton Fucsovics → replaced by 🇦🇷 Facundo Bagnis
 * 🇹🇳 Malek Jaziri → replaced by Pedro Sousa
 * 🇦🇷 Guido Pella → replaced by 🇮🇹 Stefano Travaglia

Retirements

 * 🇮🇹 Fabio Fognini

Seeds

 * Rankings are as of July 1, 2019

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇧🇦 Tomislav Brkić / Ante Pavić
 * Antonio Šančić / Nino Serdarušić

The following pair received entry as alternates:
 * 🇩🇪 Daniel Altmaier / 🇩🇪 Rudolf Molleker

Withdrawals

 * During the tournament
 * 🇮🇹 Fabio Fognini

Men's singles

 * 🇷🇸 Dušan Lajović def. 🇭🇺 Attila Balázs, 7–5, 7–5

Men's doubles

 * Robin Haase / 🇦🇹 Philipp Oswald def. 🇦🇹 Oliver Marach / 🇦🇹 Jürgen Melzer, 7–5, 6–7(2–7), [14–12]