Tim McGraw will perform an acoustic set at the 18th annual Bob Costas benefit for the SSM Cardinal Glennon Children's Medical Center in St. Louis on April 1. He is stepping in for Sheryl Crow, who canceled her appearance following recent surgery for breast cancer. Comedian Bob Saget will also appear at the event benefiting the hospital. A highly respected sports broadcaster, Costas has helped the hospital raise more than $10 million over the years. Tickets are $100, $75, $50 and $35. McGraw and Faith Hill launch their extensive Soul 2 Soul II tour on April 21 in Columbus, Ohio.