Darius Rucker is helping out with a Coke Zero and Longhorn Steakhouse promotion in conjunction with the upcoming NCAA college basketball championship. The "An Exclusive Ticket" sweepstakes allows fans a chance to win tickets to the NCAA Men's Final Four, taking place in Indianapolis, Indiana in April, as well as tickets to the "Coke Zero Countdown" concert featuring Rucker. The singer says he's happy to take part in the promotion. He notes, quote, "When Capitol came to me with the opportunity to partner with these two great brands, I immediately jumped at the chance to be involved because this allows music fans an opportunity for an unique experience while spotlighting country music." Fans can register for the sweepstakes through March 8th. Details on how to enter and additional information are available online at www.CokeZero.com/longhorn.Rucker has been spending the winter on tour with Rascal Flatts. They'll be performing in Sioux City, Iowa this Thursday.