The fan who caught Barry Bonds's record-breaking home run ball may keep it even though it has been valued at up to half a million dollars. Bonds hit his 756th homer, beating Hank Aaron's major league record, in the Giants's game against Washington on Tuesday. "It's the greatest American sports accomplishment in history. Part of me might want to sell it," 22-year-old fan Matt Murphy told NBC's Today show on Thursday. "But I really am leaning towards keeping it. It's too valuable and sentimental."