metrics - but it just has not hit the main stream or could be considered "confidential/proprietary"... I think they have all the data and I agree that there is a potential proxy - but that could also include tunnel factor and pitch selection. Keep up the great work QCP! Only pitch I had rated a 1 by Houston was a late breaker and got tons of grounders on...moved late down and away from righties but tunneled my fastball till the last 10 ft...rest of my sstuff was average AA stuff...then shoulder fell apart - lol!