There has been a power surge of late among several Mississippians, notably Bobby Bradley, Austin Riley and Hunter Renfroe. Bradley, the former Harrison Central High star, has begun to mash at Triple-A Columbus in Cleveland’s system. The 22-year-old first baseman has four homers in his last four games, three in his last two. A .366 spurt over his last 10 games has boosted his average to .315 with seven homers and 20 RBIs in his first full season at the Triple-A level. “It’s really a great experience, you learn so much from the veteran guys,” Bradley said in an milb.com story. Riley, the DeSoto Central product, hit two more bombs for Triple-A Gwinnett (Atlanta) on Wednesday. That’s 10 in his last 13 games, during which he has batted an absurd .469. He is at .315 with 12 homers and 32 RBIs. “Obviously, I’m seeing the ball well,” he told milb.com. “I’ve worked really hard on getting my swing where it is now.” Renfroe, the ex-Copiah Academy and Mississippi State standout, hit a go-ahead home run for the San Diego Padres on Wednesday. He also hit a tie-breaking bomb on Monday and a walk-off grand slam on Sunday. “He’s clutch. And he has been for a long time,” Padres manager Andy Green told mlb.com. Renfroe now has nine homers on the year, second to Mitch Moreland’s 10 among Mississippians in the majors. P.S. Ole Miss alum Zack Cozart is 2-for-8 (.125 for year) since coming off the injured list for the Los Angeles Angels, who also designated MSU product Chris Stratton for assignment on Tuesday. Stratton, who’ll likely land in Triple-A, has an 8.59 ERA in seven appearances. … Tony Sipp, the veteran reliever out of Mississippi Gulf Coast Community College, went on the 10-day IL for Washington with a strained oblique.