HOOVER, Ala. — Freshman RJ Austin hit a two-run home run to finish off a five-run first inning and Vanderbilt rolled to a 9-2 victory over Alabama on Friday night to advance to the semifinals of the SEC Tournament. Freshman Colby Shelton hit a two-run homer in the bottom of the third to pull the ninth-seeded Crimson Tide within 5-2. …