Simplify the following text for a Grade 4 native English-speaking person.
Original: Zdeno Chara has the record for hardest shot ; he set the record in 2009 when his shot went 105.4 mph .
Simplified: Zdeno Chara owns the record for the hardest shot with 105.9 mph ( 170.4 km\/h ) in 2011 , besting his own previous record of 105.4 in 2009 .