Chrsi Byrd: "This will be a great challenge, but I am always willing to accept a challenge.''

[ProBox1]

IBF heavyweight champion Chris Byrd works the heavy bag during a workout Wednesday in Reno. Byrd defends his crown against DaVarryl Williamson Saturday on SHOWTIME (9:15 p.m. ET/PT, delayed on the west coast). In the co-feature on SHOWTIME CHAMPIONSHIP BOXING, James Toney risks his IBA heavyweight belt against DaVarryl Williamson. [details]