[6] Kuzmanov started playing in ITF Junior Circuit in 2008 and even in his third participation in tournaments of this level he reached to a final – it happened at Dema Cup U18 – Sofia, Bulgaria, where he lost in a very competitive match.

[7] His most significant achievements are reaching to a final singles match at 2011 European Junior Championships U18 – Klosters, Switzerland and semi-final doubles match at 2011 Roland Garros Junior Championships U18 – Paris, France, as well as winning 2 singles titles at Plovdiv Cup U18 – Plovdiv and Kenana CUP U18 – Haskovo in Bulgaria.

[7] Dimitar Kuzmanov made his professional debut at Bulgaria F2 ITF Futures Tournament – at age of 15 years and 9 months.

[5] He won his first doubles title at ITF Futures F10 Tournament – Antalya, Turkey, partnering compatriot Tihomir Grozdanov.

Late during the season, he played few singles and doubles finals and semi-finals at ITF Futures tournaments.

[17] Partnering with compatriot Alexander Lazov he played vs. future tournament champions Matwe Middelkoop and Wesley Koolhof, losing in three sets.

[5] In this year Kuzmanov continued to play ITF Futures tournaments and won singles title No.

Partnering with compatriot Alexander Lazov he played in the main draw doubles (MDD) and won 6-4/6-7(9)/10-7 vs. Ariel Behar and Andrei Vasilevski.

Closing the season Kuzmanov participated in 1 ITF Futures tournament and 4 ATP Challenger Tour events in South America achieving 18 wins in 22 matches.

His most successful participation in the tour was at the Lima Challenger Event – a quarterfinal showing in MDS where he lost to world No.

Before that, however, he managed to record his first victory over a top 100 player – in the match against Roberto Carballes Baena (ESP).

The participation at Santiago 2 Challenger Event was also successful – partnering with Gonçalo Oliveira (POR) he reached the quarterfinals in MDD, losing 1-6/3-6/ by the Brazilian players Guilherme Clezar and Fabricio Neis.

As a Davis Cup player Kuzmanov played vs. Armenia, Greece and Ireland winning all his own single matches.

[5] Dimitar Kuzmanov started the year in a remarkable way – he participated in January and February in 4 ITF Futures tournaments winning two of them, and the other two playing the final with 18 victories and only 2 losses.

Partnering with compatriot Vasko Mladenov he played in MDD and lost 4-6/4-6 by Scott Lipsky (USA) and Divij Sharan (IND).

He participated in the 2019 Sofia Open for the fourth time as a wildcard where he also lost in the first round to Robin Haase in straight sets.

[19] In March 2021, Kuzmanov reached his first ATP Challenger final at the Zadar Open in Croatia which he lost 6-2/2-6/6-7(5) to Serbian Nikola Milojevic.

He also entered the qualifications at the 2021 Wimbledon Championships for the first time in his career where he also lost to Marius Copil in straight sets.

He defeated Lorenzo Musetti in a tight three set match over 3 hours to finally record his first win at his home tournament.

Kuzmanov became the second Bulgarian to win a match in the main draw in Sofia after Grigor Dimitrov, who won the tournament title in 2017.

After losing in the first qualifying round in his first three Grand Slam appearances in 2021, Kuzmanov recorded his maiden win at that level at the 2022 Australian Open.

In May he reached the third round of qualifying at the 2022 French Open defeating Flavio Cobolli in three sets, getting one step closer to the main draw.

[27] Kuzmanov repeated his success at the 2022 Wimbledon Championships, where he once again reached the third round of qualifying, but ultimately couldn't make the step further to his maiden main draw appearance, losing out in four sets to Enzo Couacaud.