SI.com: The athlete atop our athlete power list is LeBron James. Who is the equivalent of LeBron in your universe?
Martin: Well, LeBron James is the greatest active basketball player I suppose so the parallel in Westeros would be
who is the greatest active swordsman. You can make a case for Jamie Lannister.

You can make a case for The Hound

or his brother Ser Gregor [Clegane]

or Sir Loras [Tyrell], the Knight of Flowers

. These are all first class Knights. Or even Ser Barristan The Bold [Sir Barristan Selmy]

. These are all guys who are top at their own particular sport, which is swordsmanship and jousting, and all of the combat skills that attend knighthood.