The team was promoted in 2010 and after spending the 2010–2011 season in the LKL and the Baltic Basketball League, he joined Olney Central College in the United States during the summer.
[3] After being without a team for the first half of the 2013–2014 season, Mockevičius joined KK Vrsac Swisslion of the Basketball League of Serbia in February 2014.
[5] During the summer of 2018, Mockevičius started training with Keflavík and in September the club signed him for the 2018–2019 season[6] where he instantly became a fan favorite.
[9] On 20 March, the head coach of Keflavík, Sverrir Þór Sverrisson, stated that Mockevičius was AWOL from the team and would therefore not play for it again this season.
[10] Mockevičius played in 2013 FIBA Europe Under-20 Championship for Lithuania men's national under-20 and at the 2010 Summer Youth Olympics.