Slavko Kalezić is a Montengrin singer and actor who came to fame in 2013 as a participant on X Factor Adria where he was mentored by Serbia's 2004 and 2012 Eurovision representative Željko Joksimović but did not make the live shows.
He was selected to represent his home country in the Eurovision Song Contest 2017 in Kiev with the song "Space" but failed to advance from the first semi final.
In July of the same year, it was revealed that he had auditioned for the UK version of The X Factor, later revealing that Irish music manager Louis Walsh, who manages Brendan Murray, invited him to particpate following their meeting at Eurovision. He ended up in the Overs category mentored by Nicole Scherzinger and advanced to Judges' Houses but was not selected as part of her Top 3 for the live shows. However, he was among the acts vying for a wildcard vote but did not get enough votes in order to reach the live shows.