Kinematic data (position data) of eleven baseball pitchers who performed 25 fastballs recorded with a VICON motion capture system. The pickle-files (version 4.0) contain the position data of a static anatomical reference posture ('STATIC') and a fastball pitch motion ('PITCH') the landmarks attached to our subjects according to the modified plug-in-gait model. The anatomical landmarks of the static posture and pitch motion are organised in Python dictionaries containing pandas DataFrames (version 1.1.0) with the X, Y and Z coordinates. The data contains filtered and unfiltered preprocessed data. Also the calculated external valgus torques and ball speeds of each participant can be found here.