2021 Croatia Open Umag
The 2021 Croatia Open is a men's tennis tournament played on outdoor clay courts. It is the 31st edition of the Croatia Open, and part of the 250 Series of the 2021 ATP Tour. It take place at the International Tennis Center in Umag, Croatia, from 19 through 25 July 2021. Seventh-seeded Carlos Alcaraz won the singles title.
Finals
Singles
Carlos Alcaraz defeated Richard Gasquet, 6–2, 6–2Doubles
Fernando Romboli / David Vega Hernández defeated Tomislav Brkić / Nikola Ćaćić, 6–3, 7–5Points and prize money
Prize money
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q2 | Q1 |
| Singles | €41,145 | €29,500 | €21,000 | €14,000 | €9,000 | €5,415 | €2,645 | €1,375 |
| Doubles* | €15,360 | €11,000 | €7,250 | €4,710 | €2,760 |
*per team
Singles main draw entrants
Seeds
1 Rankings are as of 12 July 2021.Other entrants
The following players received wildcards into the main draw:The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Withdrawals
;Before the tournament- Salvatore Caruso → replaced by Renzo Olivo
- Taro Daniel → replaced by Andrej Martin
- Lorenzo Musetti → replaced by Carlos Taberner
Doubles main draw entrants
Seeds
- 1 Rankings are as of 12 July 2021.
Other entrants
The following pairs received wildcards into the doubles main draw:Withdrawals
;Before the tournament- Simone Bolelli / Máximo González → replaced by Damir Džumhur / Antonio Šančić