Charles Martin KO1 Matthew McKinney.... Former IBF champion Charles Martin took a successful first step back into heavyweight contention on Saturday. Martin hadn't fought in about sixteen months since losing to Jared Anderson, but he didn't need much warm-up time against Matthew McKinney. Martin scored a first-round knockout of McKinney in Redwood City, California to boost his career record to 30-4. McKinney had won four of his last five but drops to 17-8-3 overall.