Sporting achievements:

World Champion 2007, Champions League Winner 2007 and 2010

Klein stands out due to his variable throws, his speed and further skills. Therefore he could also play in the centre-back position in addition to his usual position (left wing). The player from THW Kiel, who is 1.90 metres tall, had a difficult season, as he missed the ECh 2010. However he won the national championship and the Champions League with THW Kiel, and returned to the national team.