| Date: | 4–10 November |
| Edition: | 20th |
| Category: | ATP Challenger Tour |
| Location: | Bratislava, Slovakia |
| Champs: |  Dennis Novak |
| Champd: | Frederik Nielsen / Tim Pütz |
The 2019 Slovak Open was a professional tennis tournament played on indoor hard courts. It was the 20th edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Bratislava, Slovakia between 4 and 10 November 2019.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Kazakhstan | Mikhail Kukushkin | 67 | 1 | |
 Hungary | Márton Fucsovics | 69 | 2 | |
 Italy | Stefano Travaglia | 88 | 3 | |
 Poland | Kamil Majchrzak | 90 | 4 | |
 Bosnia and Herzegovina | Damir Džumhur | 91 | 5 | |
 Australia | Alexei Popyrin | 95 | 6 | |
| Italy | Salvatore Caruso | 96 | 7 | |
| Lloyd Harris | 103 | 8 | ||
 Belarus | Egor Gerasimov | 104 | 9 | |
 France | Antoine Hoang | 107 | 10 | |
 Slovakia | Norbert Gombos | 109 | 11 | |
| Yannick Maden | 116 | 12 | ||
| Peter Gojowczyk | 118 | 13 | ||
 Czech Republic | Jiří Veselý | 119 | 14 | |
| Italy | Gianluca Mager | 120 | 15 | |
 Sweden | Elias Ymer | 123 | 16 |
The following players received wildcards into the singles main draw:
Andrej Glváč Lukáš Klein Lukáš Lacko Alex Molčan Máté ValkuszThe following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
See main article: 2019 Slovak Open – Singles.
Dennis Novak def. Damir Džumhur 6–1, 6–1.See main article: 2019 Slovak Open – Doubles.
Roman Jebavý / Igor Zelenay 4–6, 7–6(7–4), [11–9].
