In both singles and doubles, Lajović won several future tournaments at the beginning of his career , which gave him a few places in the rankings. On the Challenger Tour he won his first title at the Samarqand tournament in August 2012 , whereupon he was able to make up places in the world rankings and advanced to position 137. He has also achieved respectable success on the ATP World Tour . In 2011 he was able to qualify for the main fields in Zagreb , Moscow and Umag , in Belgrade he received a wild card . However, he was always eliminated in the first round. He also qualified in St. Petersburg , but this time survived the first round. After beating Jérémy Chardy in two sets , a hard-fought three-set win over Dudi Sela followed . In the quarterfinals he had no chance against Alex Bogomolov junior , he clearly lost in straight sets. In 2012 he took part in the qualification for a Grand Slam tournament at the Australian Open for the first time , but was eliminated in the first round. He had already led 5-0, 40-0 in the third set against Matteo Viola , but could not use a total of nine match points and lost the set and with it the match 6: 8 against the later qualifier.
In 2012 he was first nominated for the Serbian Davis Cup team . In the first round match against Sweden he made his debut in the last individual against Filip Prpic after Serbia was already unassailable . He won in two sets 6: 4, 6: 4.
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Serbia
Umag
Attila Balázs
Samarqand
Caltanissetta
Robin Haase
Seoul
Julian Reister
Banja Luka
Victor Hănescu
Båstad
Leonardo Mayer
Le Gosier
Denis Kudla
Monte Carlo
Istanbul
Radu Albot
Cheng you
Jonathan Erlich Fabrice Martin
František Čermák Lukáš Rosol