This also includes fighters who may have won a world title later in the career but only the title attemps before they got before their first title count. If they have never won a title that's cool too Bruno has 3 failed attempts Walcott has 4 failed attempts. (louis x2, Charles x2) Rematch doesn't count as he had already managed to get a world title once.
5 attempts without ever becoming champ: Santos Cardona Yaqui Lopez Rocky Juarez Leonel Hernandez Mitsunori Seki Victor Polo