Greatest Lightsaber Duelist
Anakin and Luke Skywalker demonstrated that they could both naturally learn and achieve new skills in saber combat faster than most previous swordsmen, Jedi and Sith alike. Anakin was able to best Dooku far before his greatly experienced Mentor in swordsmanship Obi-Wan Kenobi would have, and at an earlier age too. Luke showed even more progress than his Father despite the fact that he began training far later in life, it's even been hinted in an article entitled Fightsaber that Luke could mimic the forms and styles wielded by other swordsman just from facing them in combat. Whether or not Plageous designed the Choosen One to be skilled with a saber in his conception and whether this characteristic is more evolved in Luke or not is unknown.