Career
On 27 October 2014, Lajović reached his best singles rankings of world number 57. On 8 June 2015, he peaked at world number 104 in the doubles rankings. Lajović reached his highest individual ranking on the Association of Tennis Professionals Tour on 27 October 2014, when he became World Number.
57.
Foreign a long time, he 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 Saint St. Petersburg Open, he reached the quarter finals.
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 main draw of grand slam was at 2014 Australian Open and he reached 2nd round where he lost to Kei Nishikori. At the 2016 Argentina Open, Lajovic reached quarterfinals defeating world Number.
12 John Isner en route. He reached semifinals of the 2016 Brasil Open after beating top seed and world Number.
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.
Association of Tennis Professionals Challenger Tour and International Tennis Federation Futures finals
= Singles: 15 (10–5) = Doubles: 5 (4–1) =.