The 2009 Zagreb Open was a professional tennis tournament played on outdoor red clay courts. It was part of the 2009 ATP Challenger Tour. It took place in Zagreb, Croatia between May 11 and May 17, 2009.

Nationality	Player	Ranking*	Seeding
FRA	Nicolas Devilder	60	1
USA	Robert Kendrick	82	2
ARG	Leonardo Mayer	104	3
ARG	Brian Dabul	108	4
CRO	Roko Karanušić	111	5
BRA	Thiago Alves	119	6
BRA	Marcos Daniel	120	7
CZE	Jiří Vaněk	126	8

• Rankings are as of May 4, 2009.

The following players received wildcards into the singles main draw:

• Ivan Dodig
• Nikola Mektić
• Antonio Sančić
• Antonio Veić

The following players received entry from the qualifying draw:

• Andrea Arnaboldi
• Evgeny Donskoy
• Martin Fischer
• Franko Škugor

Marcos Daniel def. Olivier Rochus, 6–3, 6–4

Peter Luczak / Alessandro Motti def. Brendan Evans / Ryan Sweeting, 6–4, 6–4

• Official website
• ITF search