| 2020 Split Open | |
|---|---|
| Date | 28 September – 4 October 2020 |
| Edition | 1st |
| Surface | Clay |
| Location | Split, Croatia |
| Champions | |
| Singles | |
 Francisco Cerúndolo | |
| Doubles | |
 Treat Huey /  Nathaniel Lammons | |
The 2020 Split Open was a professional tennis tournament played on clay courts. It was part of the 2020 ATP Challenger Tour. It took place in Split, Croatia between 28 September and 4 October 2020.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 POR | Pedro Sousa | 113 | 1 |
 SVK | Jozef Kovalík | 124 | 2 |
| USA | Bradley Klahn | 134 | 3 |
 ESP | Carlos Taberner | 148 | 4 |
 SRB | Danilo Petrović | 159 | 5 |
| SVK | Martin Kližan | 162 | 6 |
 NED | Botic van de Zandschulp | 165 | 7 |
 JPN | Tatsuma Ito | 166 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following player received entry into the singles main draw using a protected ranking:
The following players received entry from the qualifying draw:
Francisco Cerúndolo def. Pedro Sousa 4–6, 6–3, 7–6(7–4). Treat Huey / Nathaniel Lammons def. 
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