It's not hard to identify Joey Ortiz as the Milwaukee Brewers player under the most pressure . A major league starting shortstop's primary job is defense, but when you've been the worst hitter in the league for the last 20-plus months, you're going to have job security issues. And after a .184 start to the season with zero extra-base hits, Ortiz is firmly in lose-the-job territory. Meanwhile, the Brewers have two top-five organizational prospects sharing time at shortstop in Triple-A: Jett Williams, one of the prizes of the Freddy Peralta trade with the New York Mets, and Cooper Pratt, who got an eight-year, $50.75 million extension last month. So if the Brewers do make the move away from Ortiz, who gets the first crack at replacing him? If you like our content,  choose Sports Illustrated as a preferred source on Google . Is Cooper Pratt the more practical option?…