Matt Wallner belted his first pro home run on Thursday. Many more are expected. Wallner, Southern Miss’ career home run leader, hit a solo shot for the rookie-level Elizabethton Twins against the Bristol Pirates in an Appalachian League game. Wallner is batting .320 (8-for-25) in six games. Minnesota drafted the Minnesota native with the 39th overall pick earlier this month; it’s the highest any Golden Eagles player has been picked. Power is Wallner’s game. The 6-foot-5 left-handed slugger tied the USM single-season record for homers this year with 23 and finished his three years in Hattiesburg with 58. The Twins drafted Wallner in the 32nd round out of high school in 2016, but Minnesota’s Mr. Baseball opted to attend North Dakota, which abruptly dropped its program. He landed at USM, where he won several national freshman of the year awards in 2017 and earned All-America nods as a sophomore and junior. A prototypical right fielder, Wallner also has a big arm. USM occasionally used him as a closer his first two years. P.S. Mississippi State product Brent Rooker, Minnesota’s No. 7 prospect and another power bat in that system, was named to the International League roster for the Triple-A All-Star Game, scheduled July 10. The former SEC Triple Crown winner is batting .277 with 12 homers and 38 RBIs for Rochester. … Ex-State standout Reid Humphreys is back on the injured list at Double-A Hartford in Colorado’s system. The right-handed closer came off the IL on June 7, allowed 11 hits and five runs in four appearances and went back on the shelf on June 21. He had 39 saves in his first three pro seasons. … George County High alum Walker Robbins, who batted .170 with two homers over his first three pro seasons, is now pitching full-time at rookie-level Johnson City in the St. Louis system. The 21-year-old lefty, a fifth-round pick in 2016, has a 2.70 ERA in three relief appearances.