Matwé Middelkoop is a Dutch professional tennis player who specialises in doubles. He has won 14 doubles titles on the ATP Tour, most notably the 2022 Rotterdam Open alongside Robin Haase, and reached a career high doubles ranking of world No. 18 on 6 February 2023.
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.
The 2013 Bet-at-home Cup Kitzbühel was a men's tennis tournament played on outdoor clay courts. It was the 69th edition of the Austrian Open Kitzbühel, as part of the World Tour 250 series of the 2013 ATP World Tour. It took place at the Tennis stadium Kitzbühel in Kitzbuehel Austria, from July 28 through August 3.
The 2014 International German Open was a men's tennis tournament played on outdoor red clay courts. It was the 108th edition of the event known that year as the International German Open and was part of the ATP World Tour 500 series of the 2014 ATP World Tour. It took place at the Am Rothenbaum in Hamburg, Germany, from 14 July through 20 July 2014. Unseeded Leonardo Mayer won the singles title.
Roberto Bautista Agut was the defending champion, but chose to defend his title in s'Hertogenbosch instead.
Rafael Nadal won the title, defeating Viktor Troicki in the final, 7–6(7–3), 6–3.
This was the first edition of the tournament.
Mate Pavić and Michael Venus were the defending champions, but decided not to defend their title.
The 2017 Sofia Open was a men's tennis tournament played on indoor hard courts. It was the second edition of the Sofia Open as part of the ATP World Tour 250 series of the 2017 ATP World Tour. It took place at the Arena Armeec in Sofia, Bulgaria, from 5 February until 12 February 2017. Third-seeded Grigor Dimitrov won the singles title.
The 2017 ABN AMRO World Tennis Tournament was a men's tennis tournament played on indoor hard courts. It took place at the Rotterdam Ahoy arena in the Dutch city of Rotterdam, between 13 and 19 February 2017. It was the 44th edition of the tournament, and part of the ATP World Tour 500 series of the 2017 ATP World Tour.
Wesley Koolhof and Matwé Middelkoop were the defending champions but chose not to defend their title.
The 2018 ABN AMRO World Tennis Tournament was a men's tennis tournament played on indoor hard courts. It took place at the Rotterdam Ahoy arena in the Dutch city of Rotterdam, between 12 and 18 February 2018. It was the 45th edition of the tournament, and part of the ATP World Tour 500 series of the 2018 ATP World Tour. The tournament also includes a Men's Wheelchair Tennis Singles and Doubles draw. The wheelchair tennis event was an ITF-1 level tournament, with a total of $32,000 prize money.
The 2018 Sofia Open was a men's tennis tournament played on indoor hard courts. It was the third 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 5 February until 11 February 2018. Unseeded Mirza Bašić, who entered the main draw as a qualifier, won the singles title.
The 2019 Sofia Open was a men's tennis tournament to be played on indoor hard courts. It was the fourth 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 5 February until 11 February 2019. Third-seeded Daniil Medvedev won the singles title.
The 2019 ABN AMRO World Tennis Tournament was a men's tennis tournament played on indoor hard courts. It took place at the Rotterdam Ahoy arena in the Dutch city of Rotterdam, between 11 and 17 February 2019. It was the 46th edition of the Rotterdam Open, and part of the ATP Tour 500 series of the 2019 ATP Tour. The tournament also included a Men's Wheelchair Tennis Singles and Doubles draw. The wheelchair tennis event was an ITF-1 level tournament, with a total of $32,000 prize money.
The 2020 Sofia Open was a men's tennis tournament played on indoor hard courts. It was the fifth edition of the Sofia Open as part of the ATP Tour 250 series of the 2020 ATP Tour. Originally scheduled for 28 September to 4 October at the Arena Armeec in Sofia, Bulgaria, but due to the COVID-19 pandemic it was rescheduled to 8 November until 14 November 2020. Unseeded Jannik Sinner won the singles title.
The 2021 Antalya Open was a men's tennis tournament played on outdoor hard courts. It was the 4th edition of the event and part of the ATP Tour 250 series of the 2021 ATP Tour. The tournament took place in Antalya, Turkey, from January 7 to 13.
The 2021 Queen's Club Championships was a tennis tournament played on outdoor grass courts at the Queen's Club in London, United Kingdom from 14 to 20 June 2021. It was the 118th edition of the event and part of the ATP Tour 500 series of the 2021 ATP Tour.
The 2021 Sofia Open was a men's tennis tournament played on indoor hard courts. It was the sixth 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. First-seeded Jannik Sinner won the singles title.
The 2022 Qatar Open was the 30th edition of the Qatar Open, a men's tennis tournament played on outdoor hard courts. It was part of the ATP Tour 250 of the 2022 ATP Tour, and took place at the Khalifa International Tennis and Squash Complex in Doha, Qatar from 14 to 19 February 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.
Roberto Bautista Agut [1] 
Wesley Koolhof / 
