Tosca is a former 7 time World Kickboxing champion.

In 1992, Tosca won his first World Kickboxing Title, winning the WKA/ISKA World Light Heavyweight Championship against American Mike Cole in Melbourne.

In 1993, Petridis beat the legendary Jean-Yves Theriault,  by points decision in a 12-round fight in Montreal, Quebec, Canada, for Thériault's world Kickboxing title, under American Kickboxing rules. Tosca in 1993, also competed in the K-2 Grand Prix 93 tournament, which was a Light Heavyweight tournament hosted by K-1. In this tournament, he beat 1991 World Karate Cup champion Toshiyuki Atokawa in the quarter finals by unanimous points decision, before losing on a very close points decision in the semi-final to Muay Thai legend, Changpuek Kiatsongrit.

In 1995, Tosca fought Dutch legend, Rob Kaman under Muay Thai rules, and after Tosca seemingly being in front on points against Kaman, the fight was stopped towards the end, after an accidental headbutt, which had the fight ruled a no contest.

Tosca also fought a few times in boxing, later in his career, where he became the Australian Cruiserweight boxing champion. In his second boxing bout, he beat former 3 time world Boxing champion Iran Barkley. His overall boxing record was 9 wins, 5 losses, and 1 draw.

Tosca also competed in one MMA match in 2004, where he defeated Judo practitioner, Peter Jones by TKO.