The 2009 GEMAX Open was a professional tennis tournament played on carpet courts. It was part of the Tretorn SERIE+ of the 2009 ATP Challenger Tour. It took place in Belgrade, Serbia between 16 and 22 February 2009.

Singles main-draw entrants

Seeds

Other entrants

The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw:

Champions

Men's singles

🇷🇸 Viktor Troicki def. 🇸🇰 Dominik Hrbatý, 6–4, 6–2

Men's doubles

🇩🇪 Michael Kohlmann / 🇩🇪 Philipp Marx def. 🇵🇰 Aisam-ul-Haq Qureshi / Lovro Zovko, 3–6, 6–2, 10–8