Ben Shelton, the 20-year-old American with the blazing-fast serve, stormed into the U.S. Open semifinals with a 6-2, 3-6, 7-6, 6-2 win over fellow American Frances Tiafoe on Tuesday, officially cementing him as the latest new rising star in U.S. tennis. Shelton is the youngest American man to reach a major semifinal since Andy Roddick in 2003 and the youngest …
