In general, the higher a hitter's exit velocity, the better off he is. However, weak contact isn't always a bad thing. In fact, if it's paired with the right launch angle -- which helps determine a batted ball's trajectory -- it can cause a lot of problems for a defense. The Cardinals discovered that on Friday night, when Giants catcher Buster Posey came through with a key two-run single in San Francisco's 8-2 victory, which kept it in sole possession of the top National League Wild Card spot.