The Athletics dual-sidearmer is a natural right-hander, but he's been better statistically as a left-hander this year
Oakland Athletics reliever Pat Venditte is a natural right-hander who throws a mid-80s fastball from both sides, along with a slider and occasional changeup, writes Howard Megdal in a 2014 profile of Venditte for Sports On Earth. Before missing most of the 2013 season with labrum surgery on his right shoulder, however, his right-handed fastball hit 94, says John Nalbone for the Times of Trenton (NJ).
The only website I know of that separates pitchers splits into both batter's handedness and pitcher's handedness is Minor League Central, which is important because Venditte does pitch at a platoon disadvantage whenever he faces a switch-hitter.