Ryan Vogelsong has been a surprisingly effective addition to the San Francisco Giants' starting rotation this season. His comand is one reason he's been fairly successful since his first start on April 28th.
For the most part, Vogelsong keeps the ball away from opposing batters. As Dave Golebiewski pointed out back in June, Vogelsong will also throw his fastball inside to righties. But overall, he's successfully managed to keep the ball away from both righties and lefties. In fact, the 34 year old righty seems to have tightened up his control even more in the last month and a half:
To both righties and lefties, Vogelsong is nailing the outside black. Opposing batters are hitting him a bit better in the last month and a half (.329 wOBA compared to .291 on the season), however. Most of this is coming from lefties who are OPSing 155 points higher against Vogelsong, compared to their season average.
Since it looks like the Giants and Diamondbacks will be battling it out for the NL West division title over the next month and a half, Vogelsong will probably need to maintain his command in order to help his team come out on top.