Alexandar Lazarov

In 2016 Lazarov made his debut at ATP level at the ATP Sofia Open. He received a wild card for the qualification of the event in his homeland, losing in two sets to the world No. 214 Marius Copil.[6] A month later Alexandar made his debut for the Bulgaria Davis Cup team against Turkey,[7] losing the first match to Marsel İlhan, but claiming his maiden win over Altuğ Çelikbilek in the second. In September he won his first ITF singles title at the Serbia F8 event in Sokobanja, defeating Filip Veger in the final.

Lazarov lost in the first qualifying round at the ATP Sofia Open in 2017 and 2018, but at the 2019 event the Bulgarian defeated Lukáš Lacko and Luca Vanni to guarantee himself a spot in the main draw for the first time. In his ATP tour main draw debut Alexandar faced former world No. 7 Fernando Verdasco, but failed to score another upset, losing to the Spaniard 2–6 1–6. After the tournament Lazarov made his Top 500 debut in the ATP rankings.

Alexandar won his second ITF singles title in 2018 at the Georgia F3 event in Telavi and a year later he added another trophy to his collection, defeating Jordan Correia in the final of the M15 event in Casablanca.

At the beginning of the 2021 season Lazarov made the qualifying draw at the Antalya Open, but lost in three sets to Lucas Miedler. In July Alexander played his first ATP Challenger main draw match at the Iași Open after two wins in the qualification draw, but his run was stopped by Marius Copil. The Bulgarian's good form continued in the following week at the M25 event in Telavi, where he didn't lose a set on his way to his fourth ITF singles title.

In September, he received a wild card for the main draw at the ATP Sofia Open, but couldn't score his maiden ATP win, losing 0–6 3–6 to Filip Krajinović. Lazarov finished his season with two consecutive ATP Challenger quarterfinals in 2021 Bahrain Ministry of Interior Tennis Challenger and 2021 Antalya Challenger IV and reached a new career-high ranking of No. 405 on 13 December.

Edition	Round	Date	Partner	Surface	Opponents	W/L	Result
2016 Europe/Africa Zone Group II	RPO	16 July 2016	Vasko Mladenov	Hard	Malek Jaziri Skander Mansouri	L	4–6, 4–6, 3–6
2017 Europe Zone Group III	RR	6 April 2017	Tihomir Grozdanov	Hard	Mikayel Khachatryan Sedrak Khachatryan	W	6–2, 6–1
2017 Europe Zone Group III	RR	7 April 2017	Tihomir Grozdanov	Hard	Stamatios Kapiris Petros Tsitsipas	W	6–0, 6–4
2019 Europe/Africa Zone Group II	R1	14 September 2019	Alexander Donski	Hard	Raven Klaasen Ruan Roelofse	L	3–6, 2–6
2020 World Group II, Play-off	R1	07 March 2020	Adrian Andreev	Hard	Jesse Flores Pablo Núñez	L	6–7(9–11), 6–4, 6–7(10–12)
2021 World Group II	R1	06 March 2021	Gabriel Donev	Hard (i)	Hans Hach Verdugo Miguel Ángel Reyes-Varela	L	4–6, 4–6

• RPO = Relegation Play–off
• PPO = Promotion Play–off
• RR = Round Robin