Having cleared 5.55 in February 2005, his results were below that in the following 17 months, until Fritz made his senior breakthrough in Sweden when finishing second at the national championships in 2006, clearing 5.60 metres. This also qualified him for the 2006 European Championships on home soil, where he was eliminated in the qualification.[2]
The next year he repeated 5.60 in June before entering the 2007 European U23 Championships.[2] He heightened his personal best with 10 centimetres to 5.70 metres, which was enough for a silver medal. He thereby also qualified for the 2007 World Championships.[3] However, shortly after he sustained a strained thigh, which did not heal in time for the World Championships.[4] He did not enter the Swedish Championships either.[5]
In 2008 he notably jumped 5.62 and 5.63 on the summer meet circuit in Karlskrona and Sollentuna, before winning the Swedish Championships at 5.61 metres.[2] He was granted a berth on the Swedish Olympic team.[6] He however competed at the 2008 Olympic Games, as well as the 2008 World Indoor Championships, without reaching the final.[2]
He won the Finland–Sweden Athletics International in 2008, having finished second in 2006.[2] Fritz was also given the green light for the 2009 World Championships.[7] At the 2009 DN-Galan, he did achieve a season's best of 5.61 metres, which was good in itself, but a commentator opined that it would probably not be enough to excel at the World Championships.[8][9] In the build up to the Worlds, Fritz chose to pass the Swedish Championships, as did Alhaji Jeng who had an equal season's best at the time.[10] The 2009 World Championships ended in Fritz failing the first height.[2]
Fritz lost the entire 2010 indoor season to injury, which remained problematic in the outdoor season, which he had to sit out as well.[11][12]
