To make room in the starting rotation, Marco Estrada, who was originally slated to start Saturday, has been sent to the bullpen. His 27 home runs allowed are by far the most in the Majors and his 4.96 ERA is more than a run higher than any other Brewers starter.
Nelson, who was named a Pacific Coast League All-Star earlier this month, appeared in four games with the Brewers last September and made a spot start on May 25 this season against Miami in place of injured Yovani Gallardo. The 25-year-old pitched 5 2/3 scoreless innings and gave up five hits and three walks to earn his first career big league victory.
Nelson, Milwaukee's No. 1 prospect according to MLB.com, is 10-2 in with a 1.46 ERA 16 starts with Nashville this season.
Jamie Ross is an associate reporter for MLB.com. Jim Hoehn is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.