I've always found the Krajicek/Sampras/Courier head-toheads interesting.
Krajick had it over Sampras, 6-4.
Courier had it over Krajicek, 7-1.
Sampras had it over Courier, 16-4.
I mean, each player played the other two more than just a few times. What was it that made Krajieck have the edge over Sampras, Courier have the edge over Krajicek, and Sampras the edge over Sampras?
BTW, ARE THERE ANY MORE SCISSORS/PAPER/ROCK HEAD-TO-HEADS LIKE THE AFFORMENTIONED?
Yes, same people but replace Courier with Ivanisevic. Basically, all you need is a great player who performs not so well against someone, and you can create many rock-paper-scissors combinatons. Here, the key is Sampras and his negative H2H with Krajicek. You could certainly make some rock-paper-scissors combinations around Federer and his H2H against Nadal.