2025 Zagreb Open

The 2025 Zagreb Open was a professional tennis tournament played on outdoor clay courts. It was part of the 2025 ATP Challenger Tour and the 2025 ITF Women's World Tennis Tour. It took place in Zagreb, Croatia between 12 and 17 May 2025.

• Rankings are as of 5 May 2025.^[1]

The following players received wildcards into the singles main draw:

• Matej Dodig
• Luka Mikrut
• Dino Prižmić

The following player received entry into the singles main draw using a protected ranking:

• Kimmer Coppejans

The following players received entry into the singles main draw as alternates:

• Gonzalo Bueno
• Max Houkes
• Mili Poljičak

The following players received entry from the qualifying draw:

• Mirza Bašić
• Nerman Fatić
• Norbert Gombos
• Miloš Karol
• Dimitar Kuzmanov
• Neil Oberleitner

The following player received entry as a lucky loser:

• Luka Pavlovic

• Rankings are as of 5 May, 2025.^[2]

The following players received wildcards into the singles main draw:

• Lucija Ćirić Bagarić
• Ana Konjuh
• Tena Lukas
• Iva Primorac

The following players received entry from the qualifying draw:

• Živa Falkner
• Malene Helgø
• Ylena In-Albon
• Matilde Jorge
• Pia Lovrič
• Alice Ramé
• Natalija Senić
• Lian Tran

The following player received entry as a lucky loser:

• Kristina Novak

• Dino Prižmić def. Luca Van Assche 6–2 retired.

• Tara Würth def. Guiomar Maristany 6–2, 4–6, 6–3.

• Matej Dodig / Nino Serdarušić def. Luka Mikrut / Mili Poljičak 6–4, 6–4.

• Francisca Jorge / Matilde Jorge def. Lucija Ćirić Bagarić / Vitalia Diatchenko 6–2, 6–0.