Karašausks scored 16 goals in 24 matches, becoming the top scorer of the league and helping Skonto finish the season as the runners-up. On 18 July 2013 he scored his first goal in the UEFA Europa League, helping Skonto beat the Czech club Slovan Liberec 2–1 at home. At the end of the season Karašausks was included in the "sportacentrs.com" and "Sporta Avīze" teams of the tournament. In January 2014 he was invited to join the Russian Premier League club CSKA Moscow on trial, but, eventually, did not stay with the club. In February, he was loaned to another Russian Premier League club Rubin Kazan until the end of the season. In June 2014, after his loan spell ended, Karašausks became a free agent. He rejoined Skonto for the 2015 season, scoring in the club's Europa league game versus St Patrick's Athletic F.C. In the first part of 2016 he had a short loan spell at Piast Gliwice in Poland. In August 2016 Karašausks signed a contract with Swiss Challenge League club FC Wil. Karašausks signed with FK RFS for the 2019 season. But already before the end of 2018, Cypriot club Pafos FC – which is the partner club of Riga FC – offered to buy the players contract for about $100,000. Then on 29 January, before he got his debut for RFS, the Cypriot club announced, that they had signed the player. A week and a half later, the two clubs decided, that Karašausks was going to spend 2019 at Riga FC on loan. Karašausks was a member of Latvia U-17, Latvia U-19 and Latvia U-21 football teams. He was firstly called up to the senior side for a friendly match against Ghana on 5 June 2010, making his debut then, coming on as a substitution in the 59th minute and replacing Artjoms Rudņevs. He became Latvia's first player, born after regaining independence in 1990, to play for the national team. Karašausks returned to the national team on 7 September 2013, when he was called up for the FIFA World Cup 2014 qualifying match against Greece to fill in for the suspended Artjoms Rudņevs and Valērijs Šabala. On 19 November 2013 Karašauks, alongside five other players, was banned from the Latvia U-21 team due to disciplinary infringement after the victory over Liechtenstein on 15 November 2013.