Here’s some pitchFX data, via FanGraphs, on Javier Vazquez, detailing the horizontal movement on his pitches.
The peach colored rows represent league averages. Though Vazquez is largely above average (not to a great degree, but above average nonetheless) with each pitch, except for his slider, notice the degree to which Vazquez’s horizontal movement is lacking relative to previous years. His fastball (FA), slider (SL), and curveball (CU) are all moving less this season (thus far). Only Vazquez’s changeup (CH) and his two-seamer (FT) are demonstrating substantial horizontal movement when viewed alongside his career averages (they are actually well above his own averages).
Now, I’m not sure what is causing Vazquez’s horizontal movement issue. It could be mechanical, as that would be the best case scenario. It could also be brought on by an unspoken injury or even a change in velocity. Whatever the case may be, the lack of horizontal movement is likely another reason for Vazquez’s early season struggles.