2021 Lošinj Open

The 2021 Lošinj Open was a professional tennis tournament played on clay courts. It was the first edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Lošinj, Croatia between 18 and 24 October 2021.

2021 Lošinj Open
Date	18–24 October
Edition	1st
Surface	Clay
Location	Veli Lošinj, Croatia
Venue	Ljubicic Tennis Academy, Croatia
Champions
Singles
Carlos Taberner
Doubles
Andrej Martin / Tristan-Samuel Weissborn

Singles main-draw entrants

Seeds

Country	Player	Rank1	Seed
ITA	Marco Cecchinato	82	1
ESP	Carlos Taberner	116	2
SVK	Andrej Martin	120	3
SRB	Nikola Milojević	136	4
SLO	Blaž Rola	177	5
ITA	Alessandro Giannessi	185	6
GBR	Jay Clarke	195	7
FRA	Mathias Bourgue	201	8

• ¹ Rankings are as of 4 October 2021.

Other entrants

The following players received wildcards into the singles main draw:

• Victor Vlad Cornea
• Anthony Genov
• Mili Poljičak

The following players received entry into the singles main draw as alternates:

• Raúl Brancaccio
• Álvaro López San Martín
• Aldin Šetkić

The following players received entry from the qualifying draw:

• Nicolás Álvarez Varona
• Arjun Kadhe
• Georgii Kravchenko
• Filip Misolic

Champions

Singles

Main article: 2021 Lošinj Open – Singles

• Carlos Taberner def. Marco Cecchinato Walkover.

Doubles

Main article: 2021 Lošinj Open – Doubles

• Andrej Martin / Tristan-Samuel Weissborn def. Victor Vlad Cornea / Ergi Kırkın 6–1, 7–6^(7–5).