The 2013 Aberto de Tênis do Rio Grande do Sul was a professional tennis tournament played on Clay. It was the Second edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Porto Alegre, Brazil between 23 and 29 September 2013.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Argentina | Guido Pella | 100 | 1 | |
| Blaž Kavčič | 105 | 2 | ||
| Thiemo de Bakker | 109 | 3 | ||
| Argentina | Martín Alund | 120 | 4 | |
 Brazil | Rogério Dutra da Silva | 127 | 5 | |
| Gastão Elias | 132 | 6 | ||
| Brazil | João Souza | 140 | 7 | |
| Paul Capdeville | 149 | 8 |
The following players received wildcards into the singles main draw:
The following players used Protected Ranking to gain entry into the singles main draw:
The following players used Special Exempt to gain entry into the singles main draw:
The following players received entry from the qualifying draw:
See main article: 2013 Aberto de Tênis do Rio Grande do Sul – Singles.
Facundo Argüello def. Máximo González, 6–4, 6–1See main article: 2013 Aberto de Tênis do Rio Grande do Sul – Doubles.
Guillermo Durán / Máximo González def. 
Víctor Estrella / João Souza, 3–6, 6–1, [10–5]
