The Sword of the Morning beast the Kingslayer. He's tougher than most people Arthur has fought, but Arthur was the best swordsman in Westeros, period. Followed by Barriston and then probably Jaime.
JM
John MurdochSenior Member
^This and also currently Art's showing
Spoiler: at the Tower of Joy fighting off multiple combatants
trumps anything Jamie has done on the show unless I'm missing something.