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If its the entire flight of the ball that really puts into perspective how truly awful that HoRam/Silva/Batista trio was at the time.
UZR records the speed off the bat and does adjust for park afterwards, so there may actually be a park effect in the batted-ball mph that doesn't exist as much in UZR or DRS.
Whatever it is, I'm sure its miniscule though in non-extreme parks. Very interested to see what analysts are going to be able to churn up with this new tool.