We've been waiting a long time for a high-class son of Unbridled's Song to make a statement at stud and stick around to carry his name forward in pedigrees, and that horse appears to be Lane's End's Liam's Map, who got his fourth Grade l winner over the weekend. Unbridled's Song was a terrific stallion and his daughters have made him one of the best broodmare sires around, but he's had difficulties finding sons at stud as good as his daughters. He's had some that showed glimmers of talent, and...