The Brewers summoned Mat Gamel, their top offensive prospect, to the majors Wednesday night in anticipation of using the third baseman as their designated hitter in interleague play. To make room on the roster for Gamel, the Brewers sent reserve outfielder Brad Nelson outright to Class AAA Nashville. In the coming weeks, the Brewers have three interleague series on the road, where the designated hitter will be used. The first of those series is May 22-24 in Minnesota. Gamel, 23, ranked among the Pacific Coast League leaders in most offensive categories. In 33 games with Nashville, he was batting .336 with eight home runs, 31 runs batted in, 11 doubles and a triple. Gamel accumulated 20 extra-base hits, 21 walks and 34 strikeouts in 119 at-bats, with a .428 on-base percentage and .647 slugging percentage.