I have never noticed an issue with sports on plasmas, only LCD's, mind you most of the sports I have watched on Plasmas has been in HD anyway which seems to not create many issues on either format from what I have seen, at least on the newer Flatscreens.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70