KINGSPORT — Logan Dade’s walk-off, run-scoring single in the bottom of the eighth inning salvaged Senior Day for the senior first baseman and five of his Sullivan South classmates. The single, which came after Sullivan North had scored six runs in the top of the seventh to force the extra fame, gave the Rebels an 8-7 victory in their final Three Rivers Conference tilt of the regular season Saturday afternoon. The win moved South (12-8-1, 8-4) into a tie for second with Elizabethton and Sullivan East in the conference standings, although the tiebreaker will relegate the Rebels to the fourth seed in the District 1-AA tournament that starts next Friday at J.