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. It was founded in 1976 when it replaced the ILTF Satellite Circuit as the second tier of tennis. 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 tennis coach and former professional 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, who specializes in doubles. He reached a career-high doubles ranking of world No. 34 in November 2017. Demoliner has won five doubles titles.
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.
Dimitar Kuzmanov is a Bulgarian professional tennis player. He competes 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.
Jozef Kovalík is a Slovak professional tennis player who competes on the ATP Challenger Tour. He has a career-high ATP singles ranking of world No. 80 and a doubles ranking of No. 245 reached in 2018. He is currently the No. 1 Slovak player.
Grégoire Jacq is a French tennis player. He has a career high ATP doubles ranking of world No. 62 achieved on 14 October 2024. Jacq has won 10 ATP Challenger doubles titles. He also has a career high singles ranking of No. 332 achieved on 29 October 2018.
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 Bulgarian professional tennis player, who competes mainly on the ATP Challenger Tour. He has a career-high ATP singles ranking of World No. 183 achieved on 18 September 2023. He won the 2018 US Open Junior doubles title with Anton Matusevich. He also has a career-high doubles ranking of world No. 584 achieved on 12 September 2022. He is currently the No. 2 Bulgarian player.
Manuel Guinard is a French tennis player. He has a career high ATP doubles ranking of world No. 67 achieved on 18 November 2024 and a singles ranking of No. 134 achieved on 31 October 2022. Guinard competes mainly on the ATP Challenger Tour where he has won 15 doubles and 2 singles titles.
Arthur Cazaux is a French professional tennis player. He has a career high ATP singles ranking of world No. 67 achieved on 4 November 2024. He also has a career high doubles ranking of world No. 430, achieved on 1 November 2021. Cazaux has won 3 Challenger singles titles.
Flavio Cobolli is an Italian professional tennis player. He has a career high ATP singles ranking of world No. 30 achieved on 30 September 2024 and a doubles ranking of No. 316 achieved on 11 April 2022. He is currently the No. 3 ranked Italian.
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 
