Hailed by critics as a long overdue portrait of Sugar Ray Robinson, a man who was as elusive out of the ring as he was magisterial in it, Pound for Pound is a lively and nuanced profile of an athlete who is arguably the best boxer the sport has ever known. So great were Robinson's skills, he was eulogized by Woody Allen, compared to Joe Louis, and praised by Muhammad Ali, who called him the king, the master, my idol. But the same discipline that...