Matwé Middelkoop is a Dutch professional tennis player who specialises in doubles.
Artem Yurievich Sitak is a Russian-born New Zealand professional tennis player. On 11 August 2008, he reached his highest ATP singles ranking of World No. 299, whilst his highest doubles ranking of World No. 32 was reached on 10 September 2018, after the US Open. He is the younger brother of Dmitri Sitak, who was also a professional tennis player.
Dimitar Kuzmanov is a Bulgarian professional tennis player and the current No. 2 Bulgarian in the ATP singles rankings. 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.
Tuna Altuna is a Turkish tennis player.
Alexandar Lazarov is a Bulgarian professional tennis player. His highest singles ranking is No. 275 achieved on 31 October 2022, whilst his best doubles ranking is No. 359 achieved on 3 February 2020.
David Vega Hernández is a Spanish professional tennis player.
Jonny O'Mara is a British tennis player. He has a career high ATP doubles ranking of 44 achieved on 20 May 2019. He also has a career high ATP singles ranking of World No. 489 achieved on 10 April 2017.
Marc-Andrea Hüsler is a Swiss tennis player. He has a career-high ATP singles ranking of world No. 58, achieved on 7 November 2022. In doubles, he achieved a career-high ranking of world No. 132 on 25 October 2021. He is currently the No. 1 Swiss player.
The 2018 Sofia Open was a tennis tournament played on indoor hard courts. It was the 3rd edition of the Sofia Open as part of the ATP World Tour 250 series of the 2018 ATP World Tour. It took place at the Arena Armeec in Sofia, Bulgaria, from February 5–11.
Adrian Andreev is a professional Bulgarian tennis player. Andreev has a career-high ATP singles ranking of World No. 211 achieved on 3 October 2022. Andreev 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.
Alexander Donski is a Bulgarian tennis player.
Vasil Shandarov is a Bulgarian tennis player.
Pedro Martínez Portero is a Spanish professional tennis player. During his junior career, he won the junior Davis Cup 2013. Martínez has a career high ATP singles ranking of World No. 40 achieved on 9 May 2022. He also has a career high ATP doubles ranking of World No. 53 achieved on 9 May 2022.
The 2019 Sofia Open was a tennis tournament to be played on indoor hard courts. It was the 4th edition of the Sofia Open as part of the ATP Tour 250 series of the 2019 ATP Tour. It took place at the Arena Armeec in Sofia, Bulgaria, from February 5–11.
Manuel Guinard is a French tennis player.
Luca Van Assche is a Belgian-born French tennis player.
The 2021 Sofia Open was a tennis tournament played on indoor hard courts. It was the 6th edition of the Sofia Open as part of the ATP World Tour 250 series of the 2021 ATP Tour. It was played at the Arena Armeec in Sofia, Bulgaria, from 27 September to 3 October 2021.
Plamen Milushev (Bulgarian: Пламен Милушев, is a Bulgarian professional tennis player.
Petr Nesterov is a professional Bulgarian tennis player. Nesterov has a career-high ATP singles ranking of World No. 803 achieved on 17 October 2022, whilst his best doubles ranking is No. 539 achieved on 31 October 2022.
The 2022 Sofia Open was a tennis tournament to be played on indoor hard courts. It was the 7th edition of the Sofia Open as part of the ATP World Tour 250 series of the 2022 ATP Tour. It was played at the Arena Armeec in Sofia, Bulgaria, from 26 September to 2 October 2022.
Bulgaria 
