Vik started playing tennis when he was six. He played quite successfully on the ITF Junior Tour between 1995 and 1998 and at the end of 1997 he achieved his best result in the junior world rankings with rank 8. He was most successful at the Grand Slam tournament in Melbourne . There he reached the quarter-finals in both singles and doubles in 1997. In 1998 he only lost in the same place in the semifinals against Julien Jeanpierre . After Wimbledon in 1998 he ended his junior career.
From 1998 Vik played more tournaments in the professional area, mainly on the second and third class ITF Future Tour and ATP Challenger Tour . On the Future Tour he was able to win five single and one double titles.
On the Challenger Tour, Vik never made it past the semi-finals for the first few years. His first appearance on the ATP World Tour was in Kitzbühel in 2003 . There he lost after qualifying against Florin Mergea in three sets. The year 2004 was not very successful for him and he fell out of the top 400 in the world. In 2005 he came as a surprise to his first success on the Challenger Tour. He played his way up to the final in Breslau as a qualifier, in which he beat Michal Tabara , then number 78 in the world, in two sets. Just a month later he was able to repeat this success in Kyoto . As a result, he made it into the top 200 for the first time. At the French Open , he achieved his first successful qualification for a Grand Slam tournament . In the first round he defeated Kevin Kim - his only Grand Slam victory of his career - but had to admit defeat to Carlos Moyá in the second round . He was able to win two more Challenger tournaments this year and was in the semi-finals in St. Petersburg , which he lost to Nicolas Kiefer . Vik finished his most successful year, which he started outside the top 400, in 63rd place.
In 2006 Vik played more tournaments on the World Tour and competed in all Grand Slams, but was mostly eliminated in the first or second round. At the challenge level, he was able to secure another single title in Prague and his first double title in Sunrise . At the end of the year it had slipped out of the top 100 again. Vik played more on the Challenger Tour in 2007. After a one-year break, he fought his way back up the world rankings in 2008. In 2009 he qualified for the tournament in Kitzbühel , where he failed in the first round to Nicolás Massú . His last success on the Challenger Tour came in Oberstaufen by beating his compatriot Jan Minář in the final . After he continued to slide in the world rankings in 2010, Vik ended his career at the end of 2010.