Career
He holds personal bests of 10.20 seconds and 6.56 seconds for those events. He was the 60 m silver medallist at the European Athletics Indoor Championships in 2015. Born in Neubrandenburg, he initially took part in canoe racing as a youngster, but turned more to athletics after the age of thirteen.
He later joined the athletics section of the television Wattenscheid 01 sports club
His first international competition was the 2005 European Athletics Junior Championships, where he was a 200 metres semi-finalist and a gold medallist with the German 4×100 metres relay team He established himself on the national scene in 2006 with German junior titles over 60 metres and 200 m indoors, then an outdoor 100 metres national junior title.
That year he also competed at the 2006 World Junior Championships in Athletics and was a semi-finalist in the 100 m and a relay finalist. Blum reached the peak of national athletics in his first year as a senior by winning the 60 m title at the 2007 German Indoor Athletics Championships.
This led to his first senior international call-up and he was a semi-finalist over that distance at the 2007 European Athletics Indoor Championships.
He ran in three events at the 2007 European Athletics U23 Championships: he was seventh in the 100 m final but failed to finish in the relay and 200 m. He did manage third place in the 2007 European Cup 100 m, however. He improved his personal bests over all distance that year: 10.26 seconds for the 100 m, 20.85 seconds for the 200 m and 6.59 seconds for the 60 m.
He missed the majority of the 2008 season after suffering a thigh injury and his sole highlights of 2009 were a new 60 m best of 6.56 seconds and a seventh-place finish in the relay at the 2009 European Athletics U23 Championships.
He returned to form in 2010, being runner-up to Alexander Kosenkow over 100 m at the 2010 German Athletics Championships. He teamed up with Kosenkow to take third in the relay at the 2010 European Team Championships, then was an individual semi-finalist at the 2010 European Athletics Championships.
He was national runner-up in the 100 m again at the 2011 German Athletics Championships – this time to Tobias Unger. He has a similar 2012 season, retaining his German indoor title and reaching the semi-finals at the 2012 IAAF World Indoor Championships.
After an absence during the 2013 season, he returned to top condition in the 2014 season.
That year, the 27-year-old finally improved his 100 m best to 10.20 seconds, beating his previous mark which has stood since 2007. He also helped the German relay quartet, including Sven Knipphals, Kosenkow and Julian Reus, to second place at the 2014 European Team Championships held in his native Germany. Blum equalled his 60 m best at the German Indoor Championships in 2015, winning in a time of 6.56 seconds.
He finally reached an international individual podium at the 2015 European Athletics Indoor Championships.
Outdoor
100 metres – 10.20 (2014)
200 metres – 20.85 (2007)
Indoor
60 metres – 6.56 (2009 & 2015)
200 metres – 21.37 (2007)
All information from IAAF.