Fastball 93-94 with a pretty good split when he throws it for a strike. I would assume he has another pitch too. Hitters look like they just have no clue what's coming. Not sure if it's because of his lack of track record, or deception in his delivery, or what. In my opinion the best article that has been written on Guerra is here: http://host.madison.com/wsj/sports/baseball/professional/brewers-junior-guerra-finds-success-at-end-of-long-winding/article_17169e09-577a-584c-8650-421c3799dcfb.html It basically says Guerra is similar to RA Dickey in that he mastered a tough pitch late in his career. The danger is that the splitter is tough on a pitchers arm. I've talked to a couple scouts who are in agreement with the author. Here is the article in full. MILWAUKEE — Were it not the first official transaction of David Stearns’ tenure as Milwaukee Brewers general manager, hardly anyone would have noticed when they claimed right-hander Junior Guerra off waivers from the White Sox on Oct. 7 of last year. But fast forward nearly nine months and Guerra has become one of the most fascinating stories on the roster as the Brewers hit the midway point of their first season in the Stearns-orchestrated rebuilding process. The 31-year-old Venezuelan native had appeared in just three big league games before the Brewers summoned him from Colorado Springs to replace struggling right-hander Taylor Jungmann on May 1. He was hardly a dominant force in Class AAA, posting a 0-2 record and 4.63 ERA. But since joining Milwaukee he’s been lights-out, going 6-1 with a 2.93 ERA in 12 starts. And he’s been getting better every time out. Guerra hasn’t allowed a run in his past two starts, covering 15 1/3 innings of work. In those contests, he’s allowed four hits, four walks and struck out 14 against the Dodgers and Nationals, two of the better teams in the National League. “It feels like he’s even getting better,” Brewers manager Craig Counsell said after Monday’s game against the Nationals. “In the biggest spots he seems to step up even a little more.” On the surface, Guerra’s run is impressive enough. But it becomes even more noteworthy when you consider the route he took to get to this point. Signed as an international free agent by the Braves in 2001, as an outfielder and catcher, Guerra spent five years in the Braves system before being converted to a pitcher only to be released the next spring. Guerra spent a year out of baseball but signed with the Mets organization in 2007. A year later, he was suspended 50 games for violating Minor League Baseball’s drug policy and was later released. This is when things really get interesting. After sitting out of baseball a year, Guerra got back into the game by pitching for an unaffiliated, independent league team in Wichita, Kansas, in 2011. From there, he played for Yucatan in the Mexican League, back to Wichita and then a stint in Italy. It was during that journey through baseball’s wilderness that Guerra developed his secret weapon: the split-finger fastball. He learned the pitch from Giants reliever Jean Machi while both played in the Venezuelan Winter League. Guerra said it took about five years to master the pitch. “I was just a fastball/slider guy, and it was around 2009 that I started throwing a splitter and playing with it,” Guerra said. It wasn’t good back then. “It wasn’t until 2011 that I started feeling comfortable with it, and I thank God I’ve had the chance to locate with it and use it. It helps a lot with my fastball and slider.” Because of the stress it can put on a pitcher’s arm, the split-finger has fallen out of favor as the game tries to protect its top pitching prospects, but for an older player with little to lose, it’s been more than viable. “Not many (throw the true splitter) and he has a really true split-finger,” catcher Jonathan Lucroy. “It is almost a borderline knuckle, the way it moves sometimes. It is hard to catch because you don’t know what is going to happen.” It’s a hard pitch for hitters to handle, too, as evidenced by Guerra’s 1.017 WHIP and his 7.1 strikeouts per nine innings. “I’ve always said the advantage goes to the pitcher when you haven’t seen him before,” Nationals manager Dusty Baker said after Guerra threw 7 1/3 shutout innings in Milwaukee’s 1-0 win at Washington. “He kind of had us fishing for that split-finger.” Guerra will get one more start before the All-Star break, taking the mound Sunday against the Cardinals in the first-half finale. Guerra is hoping to keep adding more chapters to his unusual story. “You just have to thank God that he gave you this opportunity of having a good first year. You just have to keep working hard because nothing is guaranteed,” he said.