Born on 27 June 1984 in Heidelberg, Kai Herdling is a professional football player from Germany playing currently for TSG 1899 Hoffenheim II as a midfielder.
He began his career with SG Heidelberg-Kirchheim and moved to SpVgg Neckarsteinach in the youth ranks. He has joined TSG 1899 Hoffenheim at the beginning of 2002-2003 season and in 2008-09, he left left Hoffenheim to join SV Waldhof Mannheim.
Herdling played his first division match on March 28 2008 against FC Augsburg. On 13 April 2008, he scored his first goal in the second division in the loss against Alemannia Aachen. He returned to Hoffenheim on 26 January 2009 and scored 20 goals in 34 appearance.