He left the campus of Mississippi State last spring as the SEC Triple Crown winner, hit .282 with seven homers in a brief fling in rookie ball, then advanced to the high Class A level and cruised with a .280 average and 11 homers in 40 games there. Not surprisingly, the sledding has gotten a little tougher for Brent Rooker in his second pro season. The 23-year-old first baseman/left fielder, a supplemental first-round pick by Minnesota last June, is batting .235 at Double-A Chattanooga. He has three homers, 18 RBIs, 41 strikeouts and six walks in 136 at-bats. Baseball America ranked Rooker as the Twins’ No. 7 prospect entering this season, and MLB Pipeline has him at No. 8. He’s projected to make the majors in 2020. The Double-A level has humbled many hitters, even some as skilled as Rooker. In time, he’ll adjust. He went 3-for-4 with four RBIs in a Southern League game against Tennessee on Tuesday, extending his hitting streak to seven games. … Rooker, the 2017 Ferriss Trophy winner, is one of five former honorees currently playing pro ball. The others are Drew Pomeranz, Chris Stratton, Hunter Renfroe and Auston Bousfield. The 2018 winner will be announced on Monday.