There is an interesting study on correlations between a pitcher's height and his effectiveness and durability from sabr.org back in 2010. http://sabr.org/research/does-pitcher-s-height-matter The author's conclusions (I have no idea how sound they are) are as follows: Market inefficiency? Maybe, but Anthopoulus' unwillingness to part with Stroman in a trade for the 6'5" Samardzija and the Cubs desire to obtain him would indicate that, at least in Toronto and the northside of Chicago, there is no inefficiency to exploit. As far as your direct question, would Stroman be the shortest starter in the majors were he to make it? As of right now, the answer is yes. But he wouldn't be the shortest pitcher in the game. Of the players currently on 40-man rosters that have pitched in a major league game, the Rangers Joe Ortiz holds that distinction at 5'7" tall. There are three pitchers, all relievers, that are 5'9", Eury De La Rosa, Danny Farquhar and Jason Frasor. There are three current players that have started major league games that are 5'10". Wandy Rodriguez, Pedro Hernandez and Chad Gaudin, and ten that are 5'11", Johnny Cueto, Yordano Ventura, Travis Wood, Marco Estrada, Bartolo Colon, Vidal Nuno, Sonny Gray, Robbie Erlin, Tim Lincecum and Erasmo Ramirez. You may notice that an unusually large percentage of those guys are left-handed. This supports the conclusion in the above study. The rarity of left-handed pitchers causes GMs to have to think outside the box. They don't have the luxury to discriminate on the basis of height and instead must set aside that notion in order to find pitchers talented enough to cut it in the major leagues. Talent is talent, and in the case of lefties, the fallacy that height is a good thing falls by the wayside. If it is true for left-handed pitchers, logic suggests that the same would hold true for righties as well. All of that only solidly proves one thing, however. I clearly have way too much time on my hands...