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In 2019, Dušan Lajović reached the final of the Monte-Carlo Masters, a prestigious Masters 1000 tournament. This marked a significant achievement in his career, as it was the first time he had reached the final of a Masters 1000 event. Lajović's run to the final included victories over several top-ranked players, including Alexander Zverev and Daniil Medvedev. In the final, he faced Fabio Fognini and ultimately lost in straight sets.