It's a trump card he hopes may come to fruition if the pair meet again in USA's opener against Portugal on Wednesday.
Of course, with Figo a certain start, that's all down to USA coach Bruce Arena, who admitted last week that he still hadn't decided who will keep goal between Kasey and Blackburn's Brad Friedel.
Nevertheless, Kasey recalled: "Yes, I've had a bit of success against Figo. It was back in my first season at Rayo Vallecano when we played Barcelona and drew 1-1 - and I saved a penalty from Figo in the last minute.
"To be honest though he's a great player and we were kind of hoping that little injury problem he had would set him back a little longer! It looks like he'll be fully fit.
"Everyone in world football knows about his qualities. He's strong on both sides, can create, score - that's why Real Madrid paid all that money for him.
"But Portugal aren't jiust about Figo. They have tremendous ability and have a good record as a team. We know we have our work cut out for the first game, but, hopefully, we'll catch them on the right day."
Kasey Keller is a rare breed of goalkeeper who can claim to have got the better of Portugese playmaker Luis Figo.