Yahoo Sports reports: Heavyweight boxing is entering a new era after Oleksandr Usyk’s decided to stand down as unified champion and sent his belts to different parts of the world. Usyk recently vacated his WBA, IBF and WBC heavyweight world titles “ahead of stepping into the ring for my final fight” — without saying who that “last dance,” as he put it, would be against. “I want to make them available,” the unbeaten Ukrainian said of his belts, “so the guys who are next in line can fight for them.”