1 – ROCKS D. XEBEC vs GOL D. ROGER
Rocks D. Xebec was the captain of the Rocks Pirates, a legendary pirate crew that sailed the seas 38 years before the current storyline. They were considered to be the most powerful pirate crew of their time.
Rocks D. Xebec appeared to be an incredibly vicious and ambitious man, his dream was to become the King of the World and he attacked many locations and left mass destruction in his wake to assert his dominance.
He was also considered to be the most formidable rival of the Pirate King Gol D. Roger, even more so than his subordinate Whitebeard would come to be; it took both Roger and Monkey D. Garp to finally kill Rocks D. Xebec.