In a pair of workmanlike performances, heavyweights James Toney and Chris Byrd retained their respective titles with 12-round unanimous decisions Saturday on SHOWTIME. Toney overpowered Dominick Guinn to defend his International Boxing Association (IBA) championship, while Byrd did just enough to defeat DaVarryl Williamson and retain his International Boxing Federation (IBF) crown for the fourth time. [details]