| MT:S Open powered by Sony Ericsson | |
| Current: | Serbia Challenger Open |
| Event Name: | Belgrade Challenger |
| Location: | Belgrade, Serbia |
| Venue: | Novak Tennis Center (formerly: SRPC Milan Gale Muškatirović) |
| Atp Category: | Challenger 125 |
| Surface: | Clay / Outdoors |
| Atp Draw: | 32S / 16Q / 16D |
| Atp Prize Money: | €132,180 (2021) |
| Wta Tier: | WTA 125 |
| Wta Draw: | 32 / 8 / 11 |
| Wta Prize Money: | (2021) |
| Men's Singles: |  Roberto Carballés Baena |
| Men's Doubles: |  Guillermo Durán Andrés Molteni |
| Women's Singles: |  Anna Karolína Schmiedlová |
| Women's Doubles: |  Olga Govortsova Lidziya Marozava |
The MT:S Open powered by Sony Ericsson (known until 2009 as the GEMAX Open) and now known as the Serbia Challenger Open is a professional tennis tournament played on outdoor clay courts. It is part of the ATP Challenger Tour and the Challenger series of the WTA 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. The women's edition started in 2021.
| Year | Champion | Runner-up | Score | |
|---|---|---|---|---|
| Andrey Rublev | 6–2, 6–7(4–7), 6–0 | |||
| Roberto Carballés Baena | 6–4, 7–5 | |||
| 2011–2020 | Not Held | |||
| Karol Beck | 7 - 5, 7 - 6(4) | |||
| Viktor Troicki | 6 - 4, 6 - 2 | |||
| 2008 | Roko Karanušić | 5 - 7, 6 - 1, 7 - 6(5) | ||
| 2007 | Not Held | |||
| 2006 | Janko Tipsarević | 6 - 4, 4 - 1 retired | ||
| 2005 |  Dick Norman | 6 - 2, 6 - 3 | ||
| 2004 | Nenad Zimonjić | 2 - 6, 7 - 6(3) 6 - 4 | ||
| 2003 | Dennis van Scheppingen | 7 - 5, 6 - 3 | ||
| 2002 | Mario Ančić | 6 - 2, 6 - 3 |
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
| Guillermo Durán Andrés Molteni | 6–4, 6–4 | |||
| 2011–2020 | Not Held | |||
 Ilija Bozoljac Jamie Delgado | 6 - 3, 6 - 3 | |||
| Michael Kohlmann Philipp Marx | 3 - 6, 6 - 2, 10 - 8 | |||
| 2008 |  Flavio Cipolla Konstantinos Economidis | 4 - 6, 6 - 2, 10-8 | ||
| 2007 | Not Held | |||
| 2006 | Michael Kohlmann Alexander Waske | 7 - 6(3), 6 - 3 | ||
| 2005 |  Igor Kunitsyn  Orest Tereshchuk | walkover | ||
| 2004 | Branislav Sekáč Orest Tereshchuk | 6 - 3, 6 - 4 | ||
| 2003 | Ilija Bozoljac Nenad Zimonjić | 6 - 1, 6 - 4 | ||
| 2002 | Dušan Vemić Lovro Zovko | walkover |