Serbia Challenger Open
| MT:S Open powered by Sony Ericsson | |||||||||
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| 2021 Belgrade Challenger | |||||||||
| Tournament information | |||||||||
| Event name | Belgrade Challenger | ||||||||
| Location | Belgrade, Serbia | ||||||||
| Venue | Novak Tennis Center (formerly: SRPC Milan Gale Muškatirović) | ||||||||
| Surface | Clay / Outdoors | ||||||||
| Website | Serbia Open | ||||||||
| Current champions (2021) | |||||||||
| Men's singles | Roberto Carballés Baena | ||||||||
| Women's singles | Anna Karolína Schmiedlová | ||||||||
| Men's doubles | Guillermo Durán Andrés Molteni | ||||||||
| Women's doubles | Olga Govortsova Lidziya Marozava | ||||||||
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The MT:S Open powered by Sony Ericsson (known until 2009 as the GEMAX Open) and known as the Belgrade Challenger was a professional tennis tournament played on outdoor clay courts. It was part of the ATP Challenger Tour and the Challenger series of the WTA Tour. It was also part of the Tretorn SERIE+ of the Challenger Tour. It was held annually at the Tennis Club Gemax until 2010 before its relocation to the Novak Tennis Centre since 2021 in Belgrade, Serbia. The tournament was first played in 2002. A one-year women's edition was held in 2021.