LOS ANGELES, October 30—For a sport that has taken more than its share of slings and arrows over the last few years, boxing has proven to be as resilient as its greatest champions, rising from the canvas in 2007 to again take its place among the most popular and relevant sports in the world.The latest sign that boxing is back came this week, when HBO revealed that the record-shattering May 5th super fight between Oscar De La Hoya and Floyd Mayweather did even better than initially thought, with final numbers now clocking in at 2.4 million pay-per-view...