Following this, Varga moved back up in weight to challenge for the ISKA amateur light welterweight world title against Devon Henry in Victoria on July 20, 2009. He won by split decision after a back-and-forth fight. In his final bout as an amateur, he took a unanimous decision over Nathan Smandych on October 3, 2009 in Victoria to defend his ISKA light welterweight strap and bring his record to 15-0. Having fought mostly under Oriental rules during his amateur career, Varga ventured into the Muay Thai ruleset after turning professional and spent the early part of his career fighting abroad. In his pro debut on December 12, 2009, he travelled to Flushing, New York, United States and defeated local fighter Omar Ahmed by unanimous decision. He followed this up with another unanimous decision win over Justin Greskiewicz on February 19, 2010 before being invited to compete in an eight-man tournament held in New York on July 17, 2010. Despite entering as the tournament favourite, he was eliminated at the quarter-final stage when he lost to Terrence Hill via a controversial unanimous decision. The Varga camp attempted to have the result overturned and filed a complaint with the WKA a week later. Their bid was rejected, however, as it had been submitted too late. A rematch with Greskiewicz was set for December 3, 2010 at "The Warriors Cup XIII" in Lincroft, New Jersey, US but fell through when Justin was injured in a motorcycle accident. He was nominated for the 2010 "North American Fighter of the Year" award by "Muay Thai Authority" but lost out to Kevin Ross. He returned to the ring on January 8, 2011 at a "Canada vs. China" event in Jinan, China where he won by unanimous decision under sanshou rules. With this, he earned himself a shot at the World Kickboxing Network (WKN) World Lightweight (-64.4 kg/142 lb) Oriental Championship. Fighting in Victoria for the first time as a professional on March 12, 2011, he heavily utilized knees and sweeps over five rounds to take the unanimous decision and come away with the belt. His rematch with Justin Greskiwicz was rescheduled for "Battle at Bally's 2" in Atlantic City, New Jersey, US on August 11, 2011 but fell through again. Instead he took a second consecutive title match in which Varga knocked out Roy Tan in the third round to take the World Kickboxing Federation (WKF) World Light Welterweight (-64.5 kg/142 lb) K-1 belt in Vienna, Austria on September 24, 2011.