He was signed by the Latvian Higher League club JFK Olimps/RFS in January 2009, making his top flight debut at the age of 17.
[2] All in all he scored 10 goals in 18 league appearances and was named Young Player of the Year, receiving the Ilmārs Liepiņš prize at the end of the season.
In January 2010 Karašausks went on trial with Skonto Riga and became one of five Olimps/RFS players to be signed by the club and the newly appointed manager Aleksandrs Starkovs.
Due to injuries and conflicting with the club's board, Karašausks did not appear in a single match of the 2012 Latvian Higher League until August, when he was given out on loan to FB Gulbene.
[9] 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.
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.
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.