XM is offering baseball fans the opportunity to send personalized voice messages from baseball greats Derek Jeter, David Ortiz and Cal Ripken, Jr. to their friends and family in a viral marketing campaign.

The campaign is geared to enhance baseball fans' awareness of XM's coverage of Major League Baseball, writes MediaBuyerPlanner. XM airs every MLB game for every team from Opening Night to the World Series. "With baseball season underway, XM is truly thrilled to provide fans an interactive way to get excited about the game," Vernon Irvin, chief marketing officer at XM, said in a statement.

Fans can visit the web site www.xmradio.com/mlb to send a customized voice message from the New York Yankees star Jeter, Boston Red Sox slugger Ortiz, or Hall-of-Fame-bound Ripken. When fans arrive at the site, they choose a ball player and enter a friend's name, favorite team, hobbies, and other details. Friends will receive the voice message on their phone or via email or AOL Instant Messenger.

The campaign offers baseball fans a wide variety of choices for creating messages, which are available in Spanish or English. This campaign marks the first time that this type of audio service has been available in Spanish.