Dusan Lajovic

For a long time, Lajović primarily played on the Futures circuit and the Challenger circuit.

In 2011 he qualified for the Kremlin Cup, and lost in the first round of the main draw. In the 2011 St. Petersburg Open, he reached the quarterfinals for the first time in his career.

In 2012, he began working with a new coach, Boris Bošnjaković, played in the Davis Cup for the first time, reached the finals of 2012 Orbetello Challenger and won the 2012 Samarkand Challenger.

Replacing an injured Janko Tipsarević, he played two live rubbers in the 2013 Davis Cup final, including the deciding rubber against Radek Štěpánek of the Czech Republic. He was defeated comfortably in both but was praised by team-mate Novak Djokovic for how he coped with the big occasion.

His first appearance in the main draw of a grand slam was at Australian Open and he reached second round where he lost to Kei Nishikori. He bettered this at the French Open by reaching the fourth round where he was beaten in straight sets by then-world number one and eventual champion Rafael Nadal.

Partnered with Radu Albot, they won the Istanbul doubles title, marking the first ATP doubles title for the Serb. At the French Open he lost to eventual champion Stan Wawrinka in the second round in four sets.

At the Argentina Open, Lajović reached quarterfinals defeating world No. 12 John Isner en route. He reached the semifinals of the Brasil Open after beating top seed and world No. 20 Benoît Paire in the second round, that was his first tour-level semifinal appearance after losing all eight prior quarterfinals matches before in his career. This was followed by semifinal appearances at the 2016 Generali Open in Kitzbühel and the 2016 Los Cabos Open.

In Indian wells, the Serbian defeated five opponents to reach the fourth round eventually losing to Pablo Carreño Busta.

His contributions in successful Davis Cup ties against Russia & Spain, resulted in Serbia making the semifinal where he defeated Lucas Pouille but lost to Jo-Wilfried Tsonga.

At the Australian Open Lajović lost in five sets to US Open quarterfinalist Diego Schwartzman in his opening match. His next match was a five set loss to Miami Masters champion John Isner in a Davis Cup tie. A temporary return to the Challenger Tour resulted in winning the Open Region Guadeloupe.

After qualifying for the Monte-Carlo Masters, he faced 12 time Grand Slam champion Novak Djokovic, losing in straight sets. At the Madrid Masters, he defeated former top ten player Richard Gasquet in the second round, followed by a victory over world No. 6 Juan Martín del Potro, before falling to world No. 8 Kevin Anderson in the quarterfinals. This clay-court season was topped off with a semifinal appearance at the Lyon Open and a five-set loss at the French Open to world No. 3 Alexander Zverev.

Lajović's first-round match at Wimbledon was against defending champion & world No. 2 Roger Federer, he would lose in three quick sets. At the China Open he was able to secure his second victory over a top 10 player, defeating world No. 7 Grigor Dimitrov. On 15 October, Lajović reached the top 50 ranking for the first time in his career.

In January 2019, Lajović scored his 100th career victory and reached a new career-high ranking of world No. 45. Lajović secured his third top-ten victory in Miami defeating world No. 6 Kei Nishikori. At the Monte-Carlo Masters, he reached his maiden ATP Tour final without dropping a set. En route to the final, Lajović defeated former top 10 player David Goffin, reigning French Open finalist, world No. 5 Dominic Thiem, and world No. 14 Daniil Medvedev. His run ended in the final against Fabio Fognini in straight sets. Lajović climbed to a new career-high ranking of No. 24 at the conclusion of the tournament. Lajović won his first ATP Tour singles title at the Croatian Open in Umag, defeating Hungarian Attila Balázs in straight sets in the final.

At the inaugural ATP Cup, Lajović assisted Serbia in making history as the first nation to win Davis, World Team and ATP Cups, winning four of six matches. At the Australian Open he defeated 2018 semifinalist Kyle Edmund in straight sets before losing to world no. 14 Diego Schwartzman in the third round.

Lajović started his 2021 season representing Serbia at the ATP Cup. He lost to Milos Raonic of Canada and Jan-Lennard Struff of Germany. Despite winning last year, Serbia failed to defend the title. Seeded 23rd at the Australian Open, he reached the fourth round of a Grand Slam for a second time in his career. He ended up getting defeated by 6th seed Alexander Zverev.

Seeded third at the Open Sud de France in Montpellier, Lajović was eliminated in the second round by Dennis Novak. At the Rotterdam Open, he stunned World No. 3 and top seed, Daniil Medvedev, in the first round. With this win, Lajović was able to stop Medvedev from reaching number two in the ATP rankings. He was beaten in the second round by Borna Ćorić.

Lajović started his 2022 season by representing Serbia at the ATP Cup as the No. 1 player after the withdrawal of Novak Djokovic. Serbia was in Group A alongside Norway, Chile, and Spain. He ended up losing to Casper Ruud, Cristian Garín via retirement, and Roberto Bautista Agut. Serbia ended up third in Group A. Seeded sixth at the Sydney Classic, he was defeated in the second round by American Maxime Cressy. At the Australian Open, he was eliminated in the second round by world No. 31 Carlos Alcaraz.

Seeded fifth at the Argentina Open, Lajović was beaten in the second round by Argentinian Federico Coria. In Rio, he lost in the first round to Fernando Verdasco. At the Mexican Open, he was defeated in the second round by Tommy Paul. Playing at the Indian Wells Masters, he lost in the first round to Filip Krajinović. In Miami, he lost in the first round to Juan Manuel Cerúndolo.

Lajović kicked off his clay-court season at the Monte-Carlo Masters. He lost his second-round match to Grigor Dimitrov. Competing at the Serbia Open in his country, he was defeated in the first round by qualifier Taro Daniel. At the Estoril Open, he lost in the first round to fifth seed and eventual finalist, Frances Tiafoe. In May, Lajović played at the Madrid Open. He stunned World No. 7 and fifth seed, Casper Ruud, in the second round. He fell in the third round to World No. 14 and twelfth seed, Hubert Hurkacz. Getting past qualifying at the Italian Open, he lost in the first round to Alex de Minaur. Ranked No. 64 at the French Open, he was defeated in the first round by Sebastián Báez.

Seeded second at the Emilia-Romagna Open, an ATP Challenger event in Italy, Lajović reached the semifinals where he lost to Borna Ćorić.

Lajović played only one tournament to prepare for Wimbledon. At the Mallorca Championships, he was ousted from the tournament in the first round by Daniel Altmaier. Ranked also No. 64 at Wimbledon, he lost in the second round to Alexander Bublik.

Seeded second at the Salzburg Open, an ATP Challenger event in Austria, Lajović made it to the quarterfinals where he lost to sixth seed and eventual champion, Thiago Monteiro.

He left the top 100 at No. 102 on 21 November 2022, his lowest year-end ranking in 10 years.

In December he won the 2022 Maia Challenger, his seventh at this level.

He finished the year ranked No. 80 on 5 December 2023.

In January, Lajovic lost in three tight sets in the qualifying of ASB Classic to Christopher Eubanks. At the Australian Open, he lost in the first round in four sets against 20th seed Denis Shapovalov.

In February, during the Golden Swing in South America, he reached as a qualifier the quarterfinals of the Argentina Open after defeating reigning Córdoba Open champion Sebastián Báez in the first round. In the second round, he defeated Camilo Ugo Carabelli in straight sets to reach his first quarterfinal of the season. In the quarterfinals, he was defeated by the top seed, Carlos Alcaraz.

At the Rio Open, Lajovic reached his second quarterfinal after defeating fifth seed Diego Schwartzman in the first round and compatriot Laslo Djere in the second, both in straight sets. In the quarterfinals, he was defeated again by the top seed Carlos Alcaraz. For the second time, he reached back-to-back quarterfinals at the Chile Open by defeating again Camilo Ugo Carabelli in the first round and Juan Manuel Cerundolo in the round of 16. In the quarterfinals, he lost to Tomás Martín Etcheverry.

At the 2023 Miami Open he won his first hard court match of the season against Andy Murray. Next he defeated 30th seed Maxime Cressy to reach the third round, where he lost to Carlos Alcaraz in straight sets.

In April, he won his second career ATP title in Banja Luka. In the first round he defeated compatriot Filip Krajinović in three tight sets and in the second, eight seed Grégoire Barrère in straight sets. In the quarterfinals, he defeated top seed and world No. 1 Novak Djokovic in straight sets for the biggest win of his career. In the semifinals, he won over fourth seed and compatriot Miomir Kecmanović in three sets, after three hours of play. In the final, he defeated defending champion and second seed Andrey Rublev and returned to the top-40 in rankings.

At the 2023 Mutua Madrid Open he recorded his 100th clay match win defeating Jason Kubler in the first round becoming only the second Serbian in the Open Era after Djokovic to reach this milestone. In the second round Lajović scored his third Top 10 win in the space of nine days by taking out seventh seed Félix Auger-Aliassime.

In September, during the Davis Cup Finals in Valencia, Lajovic, playing singles, won in straight sets against Hong Seong-chan from South Korea and gave the all important first point to his Serbian Davis Cup team.

In October, Lajovic advanced to the third round of the Shanghai Masters, after beating Stanislas Wawrinka in the first round and Tallon Griekspoor in the second, both matches winning in straight sets. In the third round, he lost to Hungarian Fabian Marozsan. in the same month, he also made the second round at the next Masters in Paris as a lucky loser, defeating wildcard Benjamin Bonzi.

At the 2024 Argentina Open he reached back-to-back quarterfinals at this tournament defeating eight seed Arthur Fils and Alejandro Tabilo before losing to eventual champion, wildcard Facundo Diaz Acosta. At the 2024 Rio Open he reached back-to-back quarterfinals in two consecutive weeks.

He reached his second career semifinal above the ATP 250 level, at the 2024 Barcelona Open Banc Sabadell with wins over qualifier Diego Schwartzman, sixth seed Ugo Humbert, 11th seed Alejandro Davidovich Fokina and 16th seed Arthur Fils.

He qualified for the 2024 Paris Olympics.