The 2013 Sparkassen Open was a professional tennis tournament played on clay courts. It was the 20th edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Braunschweig, Germany between 1 and 7 July 2013.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Florian Mayer | 34 | 1 | ||
 Argentina | Horacio Zeballos | 52 | 2 | |
| Tobias Kamke | 68 | 3 | ||
 Czech Republic | Jan Hájek | 96 | 4 | |
 Brazil | Rogério Dutra da Silva | 100 | 5 | |
| Czech Republic | Jiří Veselý | 109 | 6 | |
| Argentina | Federico Delbonis | 113 | 7 | |
 Serbia | Dušan Lajović | 114 | 8 |
The following players received wildcards into the singles main draw:
Jan HájekThe following players received entry as a special exempt into the singles main draw:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Czech Republic | Lukáš Dlouhý |  Austria | Oliver Marach | 119 | 1 | |
 Romania | Florin Mergea | Brazil | André Sá | 136 | 2 | |
| Nicholas Monroe | Simon Stadler | 143 | 3 | |||
| Andre Begemann |  Canada | Adil Shamasdin | 147 | 4 |
The following pairs received wildcards into the doubles main draw:
Marek Pešička / Jiří Veselý
Andrey Golubev / 
Ivan SergeyevSee main article: 2013 Sparkassen Open – Singles.
Jiří Veselý 4–6, 6–2, 6–1See main article: 2013 Sparkassen Open – Doubles.
Tomasz Bednarek / Mateusz Kowalczyk def. 
Andreas Siljeström / 
Igor Zelenay 6–2, 7–6(7–4)