Approximately one year later on June 29 , 2007 , Lesnar defended his IWGP Heavyweight Championship against TNA World Heavyweight Champion Kurt Angle in a champion versus champion match . Inoki Genome Federation promoter Antonio Inoki had stated Lesnar was the " proper " IWGP Heavyweight Champion as he was not defeated for the title . Angle would defeat Lesnar by forcing him to tap out to the Angle lock to win the IWGP Heavyweight Championship as recognized by IGF and Total Nonstop Action Wrestling ( TNA ) . This was Lesnar 's last match as a professional wrestler until 2012 , when he re @-@ signed with WWE .