Croatia Open Umag 2018
Marco Cecchinato won the title, beating Guido Pella 6–2 7–6(4) in the final.
Main draw 28 players
- 2🇧🇦Damir Dzumhur#88Round of 16 · Lost to Evgeny Donskoy
- 3🇮🇹Marco Cecchinato#183Final · Champion
- 4🇷🇺Andrey Rublev#22Quarterfinals · Lost to Robin Haase
- 5🇪🇸Albert RamosRound of 16 · Lost to Dusan Lajovic
- 6🇳🇱Robin HaaseSemifinals · Lost to Guido Pella
- 7🇵🇹Joao SousaRound of 32 · Lost to Aljaz Bedene
- 8🇫🇷Benoit PaireRound of 32 · Lost to Marton Fucsovics
- 9🇩🇪Maximilian MartererRound of 16 · Lost to Laslo Djere
- 🇦🇷Guido PellaFinal · Lost to Marco Cecchinato
- Q🇦🇷Marco Trungelliti#91Semifinals · Lost to Marco Cecchinato
- 🇷🇸Dusan Lajovic#163Quarterfinals · Lost to Guido Pella
- 🇷🇺Evgeny DonskoyQuarterfinals · Lost to Marco Trungelliti
- 🇷🇸Laslo Djere#137Quarterfinals · Lost to Marco Cecchinato
- 🇸🇮Aljaz BedeneRound of 16 · Lost to Guido Pella
- WC🇨🇦Felix Auger Aliassime#13Round of 16 · Lost to Andrey Rublev
- 🇨🇿Jiri VeselyRound of 16 · Lost to Marco Cecchinato
- Q🇸🇰Martin KlizanRound of 16 · Lost to Robin Haase
- 🇭🇺Marton Fucsovics#144Round of 16 · Lost to Marco Trungelliti
- LL🇸🇰Andrej Martin#359Round of 32 · Lost to Felix Auger Aliassime
- WC🇭🇷Franko SkugorRound of 32 · Lost to Marco Trungelliti
- 🇨🇱Nicolas JarryRound of 32 · Lost to Martin Klizan
- 🇬🇪Nikoloz Basilashvili#87Round of 32 · Lost to Dusan Lajovic
- WC🇭🇷Nino SerdarusicRound of 32 · Lost to Maximilian Marterer
- 🇺🇾Pablo CuevasRound of 32 · Lost to Laslo Djere
- 🇮🇹Paolo LorenziRound of 32 · Lost to Evgeny Donskoy
- Q🇧🇷Rogerio Dutra SilvaRound of 32 · Lost to Robin Haase
- Q🇮🇹Stefano Travaglia#159Round of 32 · Lost to Jiri Vesely
- 🇯🇵Taro Daniel#178Round of 32 · Lost to Guido Pella