The San Francisco Giants, baseball’s hottest team with 13 wins in their past 14 games, maintained their dominance of the San Diego Padres as Brandon Crawford drilled a two-out, walk-off single to give the National League West leaders a 4-3 victory Wednesday and a sweep of the three-game series. The Giants have won all nine games between the two clubs this season, marking their first nine-game winning streak against the Padres in franchise history.