Muggeridge, called Muggas, celebrated the biggest success of his career in 2004 by winning the World Supersport Championship.
Karl Muggeridge started after a few years in motocross in 1994 with the road racing. A year later, he graduated to the Australian Suzuki 250 cc championship as runner from. In the following three years Muggeridge denied races around the world, ostensibly in the 600cc Supersport class. In 1996 he was a regular driver in the Australian Championship. In the following years he played the British Supersport Championship, which he finished in fourth place in 1999.
For season 2000 Karl Muggeridge eventually moved to the Supersport World Championship. He started for the Dutch Ten Kate Honda team on and finished the season from fifth. After the ranks of seven, 14 and four in the following years with different teams, he succeeded in 2004, his biggest hit yet. Starting Again for Ten Kate Honda on, he won seven of the ten races held and crowned himself so superior to his countryman Broc Parkes to the Supersport World Champion.
For the 2005 season, Ten Kate decided to use instead of the Superbike World Championship two motorcycles only one. Muggeridge rose to within the team and was team-mate compatriot Chris Vermeulen. After a difficult season, he finished in eleventh place of the World Cup, lagging far behind Vermeulen, who was vice-champion. 2006 succeeded Karl Muggeridge, like last year, not a single podium. Often, his performances were left behind in the race where the training. He finished the season finally in twelfth overall and remained so again far behind the results of his teammates, this time the British James Toseland who finished second, back.
That's why Karl Muggeridge lost his place in the team for 2007. Brought to you by Ten Kate for a starting place in the Supersport World Championship he refused. Instead, Muggeridge joined the newly formed Alto Evolution team, where he again drove a Honda alongside compatriot Joshua Brookes. After a few falls early in the season and only low point yield, there were mid-season major problems in the team. The previous owner of the racing team, Sergio Bertocchi, prevented a start in Misano, after Brookes left the team. Karl Muggeridge, however, finished the season at Alto Evolution and eventually became 16th overall.
In the 2008 season Muggeridge started in the World Superbike Championship for the Italian privateer team DF Racing to Honda CBR1000RR. In the first half of the season the Australians reached regularly scoring points with two sixth places as best results. In the second part of the season, however, he fell out very often. With 77 meters Muggeridge was 15th overall and making it the second best Honda privateer.
In the 2009 season Karl Muggeridge went on a Suzuki GSX- R 1000 K9 private Italian team Celani Race in the World Superbike Championship at the start. In the first twelve races of the season he reached the points only once. In the first round of the U.S. event at Miller Motorsports Park Muggeridge crashed, but remained almost uninjured. Nevertheless, he has been thoroughly investigated again after his return to Europe. It was diagnosed two vertebral fractures, which the Australians had more than two months earlier suffered at Assen. His representative in the Roman team, Alessandro Polita showed attractive performances, after which he was in spite of an existing contract with Muggeridge committed for the rest of the season by Celani. In July 2009, Karl Muggeridge tested from injury for HM Plant Honda in the British Superbike Championship, in September, he was the Suzuki factory team Suzuki Alstare BRUX as a replacement pilot for the injured Max Neukirchen committed. For the Belgian team Karl Muggeridge completed a total of six races with eighth place in Magny -Cours as the best result. In the overall standings, he reached the 22th place.
The 2010 season played Karl Muggeridge in the team Holzhauer Racing Promotion of Wittenberg, for which he started in the IDM Superbike on Honda. Already during the first season event at the Lausitzring of Australians was able to celebrate his first two victories in the German Championship and finished the season German Superbike champion. 2011 and 2012 he started for the same team and reached the third and sixth place in the drivers' standings. In September 2012, Muggeridge announced end of his career and said that they want to move back to his home, there to open a motorcycle shop.