CBS Corp said today that it is forming CBS Sports Radio, a 24-hour, seven-day-a-week lineup of national programming from CBS Radio and CBS Sports that will debut January 2, 2013. CBS Sports-branded hourly updates will kick off on affiliate stations beginning September 4. Cumulus Media will be the network’s exclusive syndicator and sales partner to secure affiliate agreements and ad sales with radio stations nationwide through Cumulus Media Networks. In addition, Cumulus will make CBS Sports Radio programming available on 67 of its owned stations. That puts the new programming in nine of the nation’s top 10 markets at launch, with a cumulative audience reach at debut close to 10 million listeners.