PokerTracker

lets say i wanted to display a stat in my hud which showed each players preflop 3 bet numbers against me only. where as the usual 3 bet stat shows how often the player reraises _anyone_, i want to know how often he reraises me in particular.

can this be done?

i guess i'd need to somehow determine which hands i was the original pfr in and then determine if this player has 3bet.

No, this cannot be done - it is not currently possible to get stats about hands against specific opponents (from a player's point of view). So from each opponent's point of view, you can't find out their stats against you specifically (or against anyone else specifically). This would be very processor intensive so I think it is unlikely to be possible any time soon.