Over the last three season Dan Haren complied a 3.47 ERA, 20th in the majors among pitchers with 400 innings. Part of Haren's success comes from presenting the batter with three different movement to his pitches. His fastball comes in as expected, with little variation from how the batters thinks it should move both horizontally and vertically:
His splitter is similar on the horizontal axis, but drops more than the fastball:
Finally, his cutter moves more relative to both axes.
In addition, the two off-speed pitches come in five to six MPH slower than his fastball. The upshot is that batters swing more and miss more on the off-speed offerings:
Haren uses movement and speed to keep hitters off balance, and his fastball does a good job of setting up his out pitches.