WBC Heavyweight Champion Vitali Klitschko and his younger brother, Wladimir, a former WBO heavyweight champion, will be guests tonight on "The Best Damn Sports Show Period" on FSN.

The show will air at 8 p.m. and 11 p.m. PT

Wladimir Klitschko makes his SHOWTIME debut when he faces NABF Heavyweight Champion DaVarryl "Touch Of Sleep'' Williamson in the main event of a SHOWTIME CHAMPIONSHIP BOXING tripleheader on Oct. 2 (9 p.m. ET/PT, delayed on West Coast) at Caesars Palace in Las Vegas. Vitali, who won the WBC belt in June, is expected to defend his title in December.