Although there are many sources available online, one of the very best sources for up-to-date professional boxing news and information is ESPN. It has an entire section dedicated to upcoming bouts, past results and current rankings across all weight divisions.
Another source is BoxingNews24.com. This site includes a forum for fan debate, an upcoming schedule and a library of boxing videos. It's free to sign up for the forum, which allows users to discuss current and past fighters. BoxRec, a third source for boxing results, has extensive historical data, including all-time records, fighter measurements and information on historical fight venues.