The ATP Challenger Tour, known until the end of 2008 as the ATP Challenger Series, is a series of international men's professional tennis tournaments. The Challenger Tour events are the second-highest tier of tennis competition, behind the ATP Tour. The ITF World Tennis Tour tournaments are on the entry-level of international professional tennis competition. The ATP Challenger Tour is administered by the Association of Tennis Professionals. Players who succeed on the ATP Challenger Tour earn sufficient ranking points to become eligible for main draw or qualifying draw entry at ATP Tour tournaments. Players on the Challenger Tour are usually young players looking to advance their careers, those who fail to qualify for ATP events, or former ATP players looking to get back into the big tour.
Blaž Kavčič is a Slovenian former professional tennis player. He was the highest ranked Slovenian male player ever, achieving a career-high of World No. 68 in August 2012, until Aljaž Bedene began to play for Slovenia again in January 2018, overtaking him with a career high ranking of 49. He became the first Slovenian ATP singles player to: achieve a Top 100 ranking, win a Grand Slam main draw match and perform at the Summer Olympics. He became the second Slovene ATP player earning over 2 million US dollars in prize money and is the second highest ever paid male Slovene player in history after Aljaž Bedene.
Marcelo Fedrizzi Demoliner is a Brazilian professional tennis player. A doubles specialist, he has won five doubles titles. He won his first title at the ATP 250 Antalya Open with Santiago González in June 2018, after having reached six finals at that level. He was runner-up at the ATP 500 Vienna in 2018 and Saint Petersburg in 2020.
Blaž Rola is a Slovenian tennis player.
Alessandro Giannessi is a professional Italian tennis player. On 24 July 2017 he reached his highest ATP singles ranking of world No. 84 while his best doubles ranking was No. 171 on 14 October 2013.
Divij Sharan is an Indian professional tennis player. He specialises in doubles and competes on the ATP World Tour. He has won five ATP doubles titles and represents India in the Davis Cup. He won a gold medal in the men's doubles at the 2018 Asian Games.
Dimitar Kuzmanov is a Bulgarian professional tennis player. He competes mostly on the ATP Challenger Tour. His highest singles ranking is No. 159 achieved on 29 August 2022, whilst his best doubles ranking is No. 438 achieved on 1 April 2019.
Nikola Milojević is a Serbian professional tennis player. Milojević has a career high ATP singles ranking of No. 125, which he achieved on 21 February 2022. He also achieved a career high ATP doubles ranking of No. 252 on 18 February 2019. He reached his highest ranking of no. 1 in ITF Junior rankings on 7 January 2013.
Félix Auger-Aliassime is a Canadian professional tennis player. He has a career-high singles ranking of No. 6, which he achieved on November 7, 2022, making him the second-highest-ranked Canadian man in ATP rankings history and the fourth-highest-ranked Canadian player in history. He has a doubles ranking of No. 60, attained on November 1, 2021. He has won five singles titles and one doubles title on the ATP Tour, and was selected as the 2022 Canadian Press athlete of the year.
Sebastian Ofner is an Austrian professional tennis player. He has a career high ATP singles ranking of World No. 37 achieved on 8 January 2024. He is currently the No. 1 Austrian player.
Adrian Andreev is a professional Bulgarian tennis player. He has a career-high ATP singles ranking of World No. 183 achieved on 18 September 2023. Andreev won the 2018 US Open Junior doubles title with Anton Matusevich. He has a career-high doubles ranking of world No. 584 achieved on 12 September 2022. He is currently the No. 2 Bulgarian player.
Holger Vitus Nødskov Rune is a Danish professional tennis player. He has been ranked as high as world No. 4 in men's singles by the Association of Tennis Professionals (ATP), making him the highest-ranked male Danish player in the history of the ATP rankings. Rune has won four ATP Tour singles titles, including a Masters 1000 title at the 2022 Paris Masters, and produced his best Grand Slam performance at the 2022 French Open by reaching the quarterfinals in his main draw debut at the tournament.
Arthur Cazaux is a French professional tennis player. He has a career high ATP singles ranking of world No. 74 achieved on 18 March 2024. He also has a career high doubles ranking of world No. 430, achieved on 1 November 2021. Cazaux has won 3 singles Challenger titles and 3 singles ITF titles.
Flavio Cobolli is an Italian professional tennis player. He has a career high ATP singles ranking of World No. 62 achieved on 4 March 2024. He also has a career high ATP doubles ranking of World No. 316 achieved on 11 April 2022.
The 2021 Zadar 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 Zadar, Croatia between 22 and 28 March 2021.
This was the first edition of the tournament.
This was the first edition of the tournament.
The 2022 Zadar Open was a professional tennis tournament played on clay courts. It was the second edition of the tournament which was part of the 2022 ATP Challenger Tour. It took place in Zadar, Croatia between 21 and 27 March 2022.
The 2023 Zadar Open was a professional tennis tournament played on clay courts. It was the third edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Zadar, Croatia between 20 and 26 March 2023.
The 2024 Zadar Open was a professional tennis tournament played on clay courts. It was the fourth edition of the tournament which was part of the 2024 ATP Challenger Tour. It took place in Zadar, Croatia between 18 and 24 March 2024.
2024 Zadar Open 
Jozef Kovalík 
Manuel Guinard 
